diff --git a/app/api/events.py b/app/api/events.py
index c90ec57..d6be9ff 100644
--- a/app/api/events.py
+++ b/app/api/events.py
@@ -147,6 +147,20 @@ class EventListResponse(BaseModel):
     total: int
 
 
+class EventHistoryResponse(BaseModel):
+    id: int
+    event_id: int
+    changed_at: datetime
+    changed_by: str
+    change_kind: str
+    before: dict[str, Any] | None
+    after: dict[str, Any]
+
+
+class EventHistoryListResponse(BaseModel):
+    items: list[EventHistoryResponse]
+
+
 # ─── 헬퍼 ───
 
 
@@ -476,6 +490,26 @@ async def get_event(
     return _to_response(ev)
 
 
+@router.get("/{event_id}/history", response_model=EventHistoryListResponse)
+async def get_event_history(
+    event_id: int,
+    user: Annotated[User, Depends(get_current_user)],
+    session: Annotated[AsyncSession, Depends(get_session)],
+):
+    """events_history 조회 — 상세 페이지 timeline. lifecycle op 자동 기록만 (v1)."""
+    await _load_owned(session, event_id, user)  # owner 검증
+    rows = await session.execute(
+        select(EventHistory)
+        .where(EventHistory.event_id == event_id)
+        .order_by(EventHistory.changed_at.desc())
+    )
+    items = [
+        EventHistoryResponse.model_validate(h, from_attributes=True)
+        for h in rows.scalars().all()
+    ]
+    return EventHistoryListResponse(items=items)
+
+
 # ─── PATCH ───
 
 
diff --git a/frontend/src/lib/components/Sidebar.svelte b/frontend/src/lib/components/Sidebar.svelte
index d36750f..38b48b8 100644
--- a/frontend/src/lib/components/Sidebar.svelte
+++ b/frontend/src/lib/components/Sidebar.svelte
@@ -2,7 +2,7 @@
   import { page } from '$app/stores';
   import { goto } from '$app/navigation';
   import { api } from '$lib/api';
-  import { ChevronRight, ChevronDown, FolderOpen, FolderTree, Inbox, Clock, Mail, Scale, StickyNote, GraduationCap } from 'lucide-svelte';
+  import { ChevronRight, ChevronDown, FolderOpen, FolderTree, Inbox, Clock, Mail, Scale, StickyNote, GraduationCap, CalendarCheck } from 'lucide-svelte';
 
   let tree = $state([]);
   let loading = $state(true);
@@ -209,6 +209,16 @@
         메모
       </span>
     </a>
+    <a
+      href="/events"
+      class="flex items-center justify-between px-3 py-2 rounded-md text-sm transition-colors
+        {$page.url.pathname.startsWith('/events') ? 'bg-accent/15 text-accent' : 'text-text hover:bg-surface'}"
+    >
+      <span class="flex items-center gap-2">
+        <CalendarCheck size={16} />
+        events
+      </span>
+    </a>
     <a
       href="/study"
       class="flex items-center justify-between px-3 py-2 rounded-md text-sm transition-colors
diff --git a/frontend/src/lib/utils/events.ts b/frontend/src/lib/utils/events.ts
new file mode 100644
index 0000000..06686f6
--- /dev/null
+++ b/frontend/src/lib/utils/events.ts
@@ -0,0 +1,242 @@
+// events 도메인 helper (PR-2 UI MVP).
+// type 정의 + 표시용 라벨 + lifecycle 호출 wrapper.
+
+import { api } from '$lib/api';
+
+export type EventKind = 'task' | 'calendar_event' | 'activity_log';
+export type EventStatus =
+  | 'inbox'
+  | 'next'
+  | 'scheduled'
+  | 'in_progress'
+  | 'done'
+  | 'cancelled'
+  | 'deferred';
+export type EventSource =
+  | 'manual'
+  | 'memo'
+  | 'email'
+  | 'chat'
+  | 'webhook'
+  | 'git_commit'
+  | 'claude_code';
+export type EventActor = 'manual' | 'eid' | 'email_ingest' | 'system';
+
+export interface EventItem {
+  id: number;
+  title: string;
+  description: string | null;
+  kind: EventKind;
+  status: EventStatus;
+  due_at: string | null;
+  start_at: string | null;
+  end_at: string | null;
+  started_at: string | null;
+  ended_at: string | null;
+  all_day: boolean;
+  timezone: string | null;
+  defer_until: string | null;
+  completed_at: string | null;
+  cancelled_at: string | null;
+  priority: number | null;
+  project_tag: string | null;
+  tags: unknown[];
+  source: EventSource;
+  source_ref: string | null;
+  raw_metadata: Record<string, unknown>;
+  memo_document_id: number | null;
+  user_id: number;
+  created_by: EventActor;
+  created_at: string;
+  updated_at: string;
+}
+
+export interface EventListResponse {
+  items: EventItem[];
+  total: number;
+}
+
+export const KIND_LABEL: Record<EventKind, string> = {
+  task: '할 일',
+  calendar_event: '일정',
+  activity_log: '기록',
+};
+
+export const STATUS_LABEL: Record<EventStatus, string> = {
+  inbox: 'Inbox',
+  next: '다음',
+  scheduled: '예정',
+  in_progress: '진행 중',
+  done: '완료',
+  cancelled: '취소',
+  deferred: '연기',
+};
+
+export const STATUS_COLOR: Record<EventStatus, string> = {
+  inbox: 'bg-slate-100 text-slate-700',
+  next: 'bg-indigo-100 text-indigo-700',
+  scheduled: 'bg-blue-100 text-blue-700',
+  in_progress: 'bg-amber-100 text-amber-700',
+  done: 'bg-emerald-100 text-emerald-700',
+  cancelled: 'bg-rose-100 text-rose-700',
+  deferred: 'bg-slate-100 text-slate-500',
+};
+
+export const KIND_COLOR: Record<EventKind, string> = {
+  task: 'border-l-4 border-indigo-400',
+  calendar_event: 'border-l-4 border-blue-400',
+  activity_log: 'border-l-4 border-emerald-400',
+};
+
+// ─── API wrappers ───
+
+export interface EventCreatePayload {
+  title: string;
+  description?: string | null;
+  kind: EventKind;
+  status?: EventStatus | null;
+  due_at?: string | null;
+  start_at?: string | null;
+  end_at?: string | null;
+  started_at?: string | null;
+  ended_at?: string | null;
+  all_day?: boolean;
+  timezone?: string | null;
+  priority?: number | null;
+  project_tag?: string | null;
+  tags?: unknown[];
+  memo_document_id?: number | null;
+  source?: EventSource;
+  source_ref?: string | null;
+  raw_metadata?: Record<string, unknown>;
+}
+
+export async function createEvent(payload: EventCreatePayload): Promise<EventItem> {
+  return api<EventItem>('/events/', {
+    method: 'POST',
+    body: JSON.stringify(payload),
+  });
+}
+
+// 빠른 행동 기록 (5초 UX 핵심) — title 1개만 받고 서버 default 활용.
+export async function logActivity(title: string, projectTag?: string | null): Promise<EventItem> {
+  const payload: EventCreatePayload = {
+    title,
+    kind: 'activity_log',
+  };
+  if (projectTag) payload.project_tag = projectTag;
+  return createEvent(payload);
+}
+
+export interface EventPatchPayload {
+  title?: string;
+  description?: string | null;
+  due_at?: string | null;
+  start_at?: string | null;
+  end_at?: string | null;
+  started_at?: string | null;
+  ended_at?: string | null;
+  all_day?: boolean;
+  timezone?: string | null;
+  priority?: number | null;
+  project_tag?: string | null;
+  tags?: unknown[];
+  memo_document_id?: number | null;
+}
+
+export async function patchEvent(id: number, payload: EventPatchPayload): Promise<EventItem> {
+  return api<EventItem>(`/events/${id}`, {
+    method: 'PATCH',
+    body: JSON.stringify(payload),
+  });
+}
+
+export async function getEvent(id: number): Promise<EventItem> {
+  return api<EventItem>(`/events/${id}`);
+}
+
+export async function listToday(timezone = 'Asia/Seoul'): Promise<EventListResponse> {
+  return api<EventListResponse>(`/events/today?timezone=${encodeURIComponent(timezone)}`);
+}
+
+export async function listInbox(): Promise<EventListResponse> {
+  return api<EventListResponse>('/events/inbox');
+}
+
+export async function listActivity(fromIso?: string, toIso?: string): Promise<EventListResponse> {
+  const params = new URLSearchParams();
+  if (fromIso) params.set('from', fromIso);
+  if (toIso) params.set('to', toIso);
+  const qs = params.toString();
+  return api<EventListResponse>(`/events/activity${qs ? '?' + qs : ''}`);
+}
+
+export async function listUpcoming(days = 7): Promise<EventListResponse> {
+  const now = new Date();
+  const to = new Date(now.getTime() + days * 86400_000);
+  const params = new URLSearchParams({
+    from: now.toISOString(),
+    to: to.toISOString(),
+    status: 'scheduled,next,deferred',
+  });
+  return api<EventListResponse>(`/events/?${params.toString()}`);
+}
+
+// Lifecycle endpoints
+
+export async function completeEvent(id: number): Promise<EventItem> {
+  return api<EventItem>(`/events/${id}/complete`, { method: 'POST' });
+}
+
+export async function cancelEvent(id: number): Promise<EventItem> {
+  return api<EventItem>(`/events/${id}/cancel`, { method: 'POST' });
+}
+
+export async function deferEvent(id: number, deferUntilIso: string): Promise<EventItem> {
+  return api<EventItem>(`/events/${id}/defer`, {
+    method: 'POST',
+    body: JSON.stringify({ defer_until: deferUntilIso }),
+  });
+}
+
+export async function reactivateEvent(id: number): Promise<EventItem> {
+  return api<EventItem>(`/events/${id}/reactivate`, { method: 'POST' });
+}
+
+// 표시 유틸
+
+export function formatDateTimeKst(iso: string | null | undefined, opts?: { dateOnly?: boolean }): string {
+  if (!iso) return '—';
+  const d = new Date(iso);
+  if (isNaN(d.getTime())) return '—';
+  if (opts?.dateOnly) {
+    return d.toLocaleDateString('ko-KR', { timeZone: 'Asia/Seoul', month: 'numeric', day: 'numeric', weekday: 'short' });
+  }
+  return d.toLocaleString('ko-KR', {
+    timeZone: 'Asia/Seoul',
+    month: 'numeric',
+    day: 'numeric',
+    hour: '2-digit',
+    minute: '2-digit',
+  });
+}
+
+export function relativeTimeKo(iso: string | null | undefined, nowMs: number = Date.now()): string {
+  if (!iso) return '';
+  const t = new Date(iso).getTime();
+  if (isNaN(t)) return '';
+  const diff = nowMs - t;
+  const abs = Math.abs(diff);
+  const future = diff < 0;
+  if (abs < 60_000) return future ? '곧' : '방금';
+  const min = Math.round(abs / 60_000);
+  if (min < 60) return future ? `${min}분 후` : `${min}분 전`;
+  const hr = Math.round(min / 60);
+  if (hr < 24) return future ? `${hr}시간 후` : `${hr}시간 전`;
+  const day = Math.round(hr / 24);
+  if (day < 30) return future ? `${day}일 후` : `${day}일 전`;
+  const mo = Math.round(day / 30);
+  if (mo < 12) return future ? `${mo}달 후` : `${mo}달 전`;
+  const yr = Math.round(mo / 12);
+  return future ? `${yr}년 후` : `${yr}년 전`;
+}
diff --git a/frontend/src/routes/events/+page.svelte b/frontend/src/routes/events/+page.svelte
new file mode 100644
index 0000000..7d6da5d
--- /dev/null
+++ b/frontend/src/routes/events/+page.svelte
@@ -0,0 +1,311 @@
+<script lang="ts">
+  import { onMount } from 'svelte';
+  import { goto } from '$app/navigation';
+  import { addToast } from '$lib/stores/toast';
+  import Button from '$lib/components/ui/Button.svelte';
+  import Card from '$lib/components/ui/Card.svelte';
+  import EmptyState from '$lib/components/ui/EmptyState.svelte';
+  import Skeleton from '$lib/components/ui/Skeleton.svelte';
+  import Tabs from '$lib/components/ui/Tabs.svelte';
+  import {
+    Inbox,
+    Sun,
+    CalendarClock,
+    History,
+    Check,
+    X as XIcon,
+    Pause,
+    RotateCcw,
+    Plus,
+  } from 'lucide-svelte';
+  import {
+    type EventItem,
+    type EventKind,
+    KIND_LABEL,
+    STATUS_LABEL,
+    STATUS_COLOR,
+    KIND_COLOR,
+    logActivity,
+    listToday,
+    listInbox,
+    listActivity,
+    listUpcoming,
+    completeEvent,
+    cancelEvent,
+    deferEvent,
+    reactivateEvent,
+    formatDateTimeKst,
+    relativeTimeKo,
+  } from '$lib/utils/events';
+
+  // 활성 탭
+  let activeTab = $state('today');
+
+  // 데이터
+  let todayItems = $state<EventItem[]>([]);
+  let inboxItems = $state<EventItem[]>([]);
+  let upcomingItems = $state<EventItem[]>([]);
+  let activityItems = $state<EventItem[]>([]);
+  let loading = $state<Record<string, boolean>>({ today: true, inbox: true, upcoming: true, activity: true });
+
+  // 빠른 행동 기록 (5초 UX 핵심)
+  let quickInput = $state('');
+  let quickSubmitting = $state(false);
+  let quickInputRef = $state<HTMLInputElement | null>(null);
+
+  // 상대 시각 tick (1분)
+  let nowTick = $state(Date.now());
+  $effect(() => {
+    const id = setInterval(() => { nowTick = Date.now(); }, 60_000);
+    return () => clearInterval(id);
+  });
+
+  onMount(() => {
+    loadAll();
+  });
+
+  async function loadAll() {
+    await Promise.all([loadToday(), loadInbox(), loadActivity(), loadUpcoming()]);
+  }
+
+  async function loadToday() {
+    loading.today = true;
+    try {
+      const res = await listToday();
+      todayItems = res.items;
+    } catch (err) {
+      addToast('error', '오늘 일정 로드 실패');
+    } finally {
+      loading.today = false;
+    }
+  }
+
+  async function loadInbox() {
+    loading.inbox = true;
+    try {
+      const res = await listInbox();
+      inboxItems = res.items;
+    } catch (err) {
+      addToast('error', 'Inbox 로드 실패');
+    } finally {
+      loading.inbox = false;
+    }
+  }
+
+  async function loadActivity() {
+    loading.activity = true;
+    try {
+      // 최근 7일
+      const to = new Date();
+      const from = new Date(to.getTime() - 7 * 86400_000);
+      const res = await listActivity(from.toISOString(), to.toISOString());
+      activityItems = res.items;
+    } catch (err) {
+      addToast('error', '활동 로드 실패');
+    } finally {
+      loading.activity = false;
+    }
+  }
+
+  async function loadUpcoming() {
+    loading.upcoming = true;
+    try {
+      const res = await listUpcoming(7);
+      upcomingItems = res.items;
+    } catch (err) {
+      addToast('error', 'Upcoming 로드 실패');
+    } finally {
+      loading.upcoming = false;
+    }
+  }
+
+  // 빠른 행동 기록 — Enter 한 번에 저장
+  async function submitQuick(e?: Event) {
+    e?.preventDefault();
+    const title = quickInput.trim();
+    if (!title || quickSubmitting) return;
+    quickSubmitting = true;
+    try {
+      const item = await logActivity(title);
+      // 새 항목을 Activity 탭 최상단에 즉시 반영
+      activityItems = [item, ...activityItems];
+      quickInput = '';
+      addToast('success', '기록됨');
+      // 입력 포커스 유지 (연속 입력)
+      quickInputRef?.focus();
+    } catch (err) {
+      const detail = (err as { detail?: string })?.detail ?? '저장 실패';
+      addToast('error', detail);
+    } finally {
+      quickSubmitting = false;
+    }
+  }
+
+  // Lifecycle ops
+  async function doComplete(item: EventItem) {
+    try {
+      const updated = await completeEvent(item.id);
+      replaceItem(updated);
+      addToast('success', '완료 처리');
+    } catch (err) {
+      addToast('error', '완료 실패');
+    }
+  }
+
+  async function doCancel(item: EventItem) {
+    if (!confirm(`"${item.title}" 취소할까요?`)) return;
+    try {
+      const updated = await cancelEvent(item.id);
+      replaceItem(updated);
+      addToast('success', '취소됨');
+    } catch (err) {
+      addToast('error', '취소 실패');
+    }
+  }
+
+  async function doDefer(item: EventItem) {
+    // 기본 = 내일 같은 시각
+    const dt = new Date(Date.now() + 86400_000);
+    const isoLocal = dt.toISOString().slice(0, 16);
+    const input = prompt('연기할 시각 (YYYY-MM-DDTHH:MM, KST)', isoLocal);
+    if (!input) return;
+    try {
+      const iso = new Date(input).toISOString();
+      const updated = await deferEvent(item.id, iso);
+      replaceItem(updated);
+      addToast('success', '연기됨');
+    } catch (err) {
+      addToast('error', '연기 실패');
+    }
+  }
+
+  async function doReactivate(item: EventItem) {
+    try {
+      const updated = await reactivateEvent(item.id);
+      replaceItem(updated);
+      addToast('success', '재활성');
+    } catch (err) {
+      addToast('error', '재활성 실패');
+    }
+  }
+
+  function replaceItem(item: EventItem) {
+    const replacer = (arr: EventItem[]) =>
+      arr.map((x) => (x.id === item.id ? item : x));
+    todayItems = replacer(todayItems);
+    inboxItems = replacer(inboxItems);
+    upcomingItems = replacer(upcomingItems);
+    activityItems = replacer(activityItems);
+  }
+
+  function timeLabel(item: EventItem): string {
+    if (item.kind === 'task') {
+      return item.due_at ? `마감 ${formatDateTimeKst(item.due_at)}` : '';
+    }
+    if (item.kind === 'calendar_event') {
+      const s = item.start_at ? formatDateTimeKst(item.start_at) : '';
+      const e = item.end_at ? formatDateTimeKst(item.end_at) : '';
+      return s && e ? `${s} – ${e}` : s;
+    }
+    // activity_log
+    return item.started_at ? relativeTimeKo(item.started_at, nowTick) : '';
+  }
+
+  const tabs = [
+    { id: 'today', label: '오늘' },
+    { id: 'inbox', label: 'Inbox' },
+    { id: 'upcoming', label: '예정' },
+    { id: 'activity', label: '활동' },
+  ];
+</script>
+
+<svelte:head>
+  <title>events · hyungi PKM</title>
+</svelte:head>
+
+<div class="mx-auto max-w-3xl space-y-6 px-4 py-6">
+  <header class="flex items-end justify-between gap-3">
+    <div class="space-y-1">
+      <h1 class="text-2xl font-semibold">events</h1>
+      <p class="text-sm text-slate-500">개인 운영 로그 · 일정 · 할 일 · 회고</p>
+    </div>
+    <Button variant="secondary" size="sm" icon={Plus} href="/events/new">새 항목</Button>
+  </header>
+
+  <!-- 빠른 행동 기록 (5초 UX 핵심) -->
+  <form onsubmit={submitQuick} class="flex items-stretch gap-2 rounded-lg border border-slate-200 bg-white p-2 shadow-sm">
+    <input
+      bind:this={quickInputRef}
+      bind:value={quickInput}
+      type="text"
+      placeholder="방금 한 일 기록… (Enter 저장)"
+      class="flex-1 rounded-md border-0 bg-transparent px-2 py-2 text-sm outline-none focus:ring-0"
+      disabled={quickSubmitting}
+      autocomplete="off"
+    />
+    <Button type="submit" variant="primary" size="sm" loading={quickSubmitting} disabled={!quickInput.trim()} icon={Plus}>
+      기록
+    </Button>
+  </form>
+
+  <Tabs {tabs} bind:value={activeTab}>
+    {#snippet children(activeId)}
+      {#if activeId === 'today'}
+        {@render eventList(todayItems, loading.today, 'today', Sun, '오늘 할 일이 없습니다')}
+      {:else if activeId === 'inbox'}
+        {@render eventList(inboxItems, loading.inbox, 'inbox', Inbox, 'Inbox 가 비어 있습니다')}
+      {:else if activeId === 'upcoming'}
+        {@render eventList(upcomingItems, loading.upcoming, 'upcoming', CalendarClock, '예정된 일정 없음')}
+      {:else if activeId === 'activity'}
+        {@render eventList(activityItems, loading.activity, 'activity', History, '최근 활동 없음')}
+      {/if}
+    {/snippet}
+  </Tabs>
+</div>
+
+{#snippet eventList(items: EventItem[], isLoading: boolean, tabId: string, EmptyIcon: typeof Sun, emptyMsg: string)}
+  {#if isLoading}
+    <div class="space-y-2">
+      {#each Array(3) as _}
+        <Skeleton class="h-16 rounded-lg" />
+      {/each}
+    </div>
+  {:else if items.length === 0}
+    <EmptyState icon={EmptyIcon} message={emptyMsg} />
+  {:else}
+    <ul class="space-y-2">
+      {#each items as item (item.id)}
+        <li>
+          <Card class="flex items-start gap-3 p-3 {KIND_COLOR[item.kind]}">
+            <div class="flex-1 min-w-0">
+              <div class="flex items-center gap-2 text-xs text-slate-500">
+                <span>{KIND_LABEL[item.kind]}</span>
+                <span class="rounded px-1.5 py-0.5 text-[10px] {STATUS_COLOR[item.status]}">
+                  {STATUS_LABEL[item.status]}
+                </span>
+                {#if item.project_tag}
+                  <span class="text-slate-400">#{item.project_tag}</span>
+                {/if}
+              </div>
+              <a href="/events/{item.id}" class="mt-1 block break-words text-sm font-medium hover:underline">
+                {item.title}
+              </a>
+              {#if timeLabel(item)}
+                <div class="mt-0.5 text-xs text-slate-500">{timeLabel(item)}</div>
+              {/if}
+            </div>
+            <div class="flex shrink-0 items-center gap-1">
+              {#if item.status !== 'done' && item.status !== 'cancelled' && item.kind !== 'activity_log'}
+                <Button variant="ghost" size="sm" icon={Check} onclick={() => doComplete(item)} title="완료" />
+                <Button variant="ghost" size="sm" icon={Pause} onclick={() => doDefer(item)} title="연기" />
+                <Button variant="ghost" size="sm" icon={XIcon} onclick={() => doCancel(item)} title="취소" />
+              {:else if (item.status === 'done' || item.status === 'cancelled') && item.kind !== 'activity_log'}
+                <Button variant="ghost" size="sm" icon={RotateCcw} onclick={() => doReactivate(item)} title="재활성" />
+              {/if}
+            </div>
+          </Card>
+        </li>
+      {/each}
+    </ul>
+  {/if}
+{/snippet}
diff --git a/frontend/src/routes/events/[id]/+page.svelte b/frontend/src/routes/events/[id]/+page.svelte
new file mode 100644
index 0000000..c04ecdd
--- /dev/null
+++ b/frontend/src/routes/events/[id]/+page.svelte
@@ -0,0 +1,308 @@
+<script lang="ts">
+  import { onMount } from 'svelte';
+  import { goto } from '$app/navigation';
+  import { page } from '$app/state';
+  import { api } from '$lib/api';
+  import { addToast } from '$lib/stores/toast';
+  import Button from '$lib/components/ui/Button.svelte';
+  import Card from '$lib/components/ui/Card.svelte';
+  import Skeleton from '$lib/components/ui/Skeleton.svelte';
+  import TextInput from '$lib/components/ui/TextInput.svelte';
+  import Textarea from '$lib/components/ui/Textarea.svelte';
+  import {
+    ArrowLeft,
+    Check,
+    X as XIcon,
+    Pause,
+    RotateCcw,
+    Save,
+  } from 'lucide-svelte';
+  import {
+    type EventItem,
+    type EventKind,
+    KIND_LABEL,
+    STATUS_LABEL,
+    STATUS_COLOR,
+    KIND_COLOR,
+    getEvent,
+    patchEvent,
+    completeEvent,
+    cancelEvent,
+    deferEvent,
+    reactivateEvent,
+    formatDateTimeKst,
+    relativeTimeKo,
+  } from '$lib/utils/events';
+
+  const eventId = $derived(parseInt(page.params.id ?? '0', 10));
+
+  let item = $state<EventItem | null>(null);
+  let history = $state<HistoryEntry[]>([]);
+  let loading = $state(true);
+  let saving = $state(false);
+
+  // edit fields (PATCH 허용만)
+  let editTitle = $state('');
+  let editDescription = $state('');
+  let editDueAt = $state('');
+  let editStartAt = $state('');
+  let editEndAt = $state('');
+  let editAllDay = $state(false);
+  let editPriority = $state<number | ''>('');
+  let editProjectTag = $state('');
+
+  interface HistoryEntry {
+    id: number;
+    event_id: number;
+    changed_at: string;
+    changed_by: string;
+    change_kind: string;
+    before: Record<string, unknown> | null;
+    after: Record<string, unknown>;
+  }
+
+  const CHANGE_KIND_LABEL: Record<string, string> = {
+    create: '생성',
+    reschedule: '시간 변경',
+    defer: '연기',
+    reactivate: '재활성',
+    complete: '완료',
+    cancel: '취소',
+  };
+
+  onMount(() => {
+    if (!eventId) {
+      addToast('error', '유효하지 않은 ID');
+      goto('/events');
+      return;
+    }
+    void load();
+  });
+
+  async function load() {
+    loading = true;
+    try {
+      const [ev, hist] = await Promise.all([
+        getEvent(eventId),
+        api<{ items: HistoryEntry[] }>(`/events/${eventId}/history`),
+      ]);
+      item = ev;
+      history = hist.items;
+      // edit fields seed
+      editTitle = ev.title;
+      editDescription = ev.description ?? '';
+      editDueAt = isoToLocalInput(ev.due_at);
+      editStartAt = isoToLocalInput(ev.start_at);
+      editEndAt = isoToLocalInput(ev.end_at);
+      editAllDay = ev.all_day;
+      editPriority = ev.priority ?? '';
+      editProjectTag = ev.project_tag ?? '';
+    } catch (err) {
+      const detail = (err as { detail?: string })?.detail ?? '로드 실패';
+      addToast('error', detail);
+      if ((err as { status?: number })?.status === 404) goto('/events');
+    } finally {
+      loading = false;
+    }
+  }
+
+  function isoToLocalInput(iso: string | null): string {
+    if (!iso) return '';
+    const d = new Date(iso);
+    if (isNaN(d.getTime())) return '';
+    // YYYY-MM-DDTHH:MM (KST 변환은 브라우저 default)
+    const off = d.getTimezoneOffset();
+    const local = new Date(d.getTime() - off * 60_000);
+    return local.toISOString().slice(0, 16);
+  }
+
+  function localInputToIso(s: string): string | null {
+    if (!s) return null;
+    const d = new Date(s);
+    if (isNaN(d.getTime())) return null;
+    return d.toISOString();
+  }
+
+  async function save() {
+    if (!item || saving) return;
+    saving = true;
+    try {
+      const patch: Record<string, unknown> = {};
+      if (editTitle !== item.title) patch.title = editTitle;
+      if ((editDescription || null) !== (item.description ?? null))
+        patch.description = editDescription || null;
+      const newDue = localInputToIso(editDueAt);
+      if (newDue !== item.due_at) patch.due_at = newDue;
+      const newStart = localInputToIso(editStartAt);
+      if (newStart !== item.start_at) patch.start_at = newStart;
+      const newEnd = localInputToIso(editEndAt);
+      if (newEnd !== item.end_at) patch.end_at = newEnd;
+      if (editAllDay !== item.all_day) patch.all_day = editAllDay;
+      const newPriority = editPriority === '' ? null : Number(editPriority);
+      if (newPriority !== item.priority) patch.priority = newPriority;
+      if ((editProjectTag || null) !== (item.project_tag ?? null))
+        patch.project_tag = editProjectTag || null;
+
+      if (Object.keys(patch).length === 0) {
+        addToast('info', '변경 사항 없음');
+        return;
+      }
+      const updated = await patchEvent(item.id, patch);
+      item = updated;
+      addToast('success', '저장됨');
+      // history 가 새 reschedule row 가질 수 있어 reload
+      await reloadHistory();
+    } catch (err) {
+      const detail = (err as { detail?: string })?.detail ?? '저장 실패';
+      addToast('error', detail);
+    } finally {
+      saving = false;
+    }
+  }
+
+  async function reloadHistory() {
+    if (!item) return;
+    try {
+      const hist = await api<{ items: HistoryEntry[] }>(`/events/${item.id}/history`);
+      history = hist.items;
+    } catch (err) {
+      // silent
+    }
+  }
+
+  async function lifecycle(action: 'complete' | 'cancel' | 'defer' | 'reactivate') {
+    if (!item) return;
+    try {
+      let updated: EventItem;
+      if (action === 'complete') updated = await completeEvent(item.id);
+      else if (action === 'cancel') {
+        if (!confirm(`"${item.title}" 취소할까요?`)) return;
+        updated = await cancelEvent(item.id);
+      } else if (action === 'defer') {
+        const dt = new Date(Date.now() + 86400_000);
+        const input = prompt('연기할 시각 (YYYY-MM-DDTHH:MM, KST)', isoToLocalInput(dt.toISOString()));
+        if (!input) return;
+        updated = await deferEvent(item.id, new Date(input).toISOString());
+      } else {
+        updated = await reactivateEvent(item.id);
+      }
+      item = updated;
+      addToast('success', '처리됨');
+      await reloadHistory();
+    } catch (err) {
+      const detail = (err as { detail?: string })?.detail ?? '실패';
+      addToast('error', detail);
+    }
+  }
+
+  function actorLabel(actor: string): string {
+    return { manual: '나', eid: '이드', email_ingest: '메일', system: '시스템' }[actor] ?? actor;
+  }
+</script>
+
+<svelte:head>
+  <title>{item?.title ?? 'events'} · hyungi PKM</title>
+</svelte:head>
+
+<div class="mx-auto max-w-3xl space-y-6 px-4 py-6">
+  <div class="flex items-center gap-2">
+    <Button variant="ghost" size="sm" icon={ArrowLeft} href="/events" />
+    <h1 class="text-xl font-semibold">events 상세</h1>
+  </div>
+
+  {#if loading}
+    <Skeleton class="h-64 rounded-lg" />
+  {:else if item}
+    <Card class="space-y-4 p-4 {KIND_COLOR[item.kind]}">
+      <div class="flex flex-wrap items-center gap-2 text-xs text-slate-500">
+        <span>{KIND_LABEL[item.kind]}</span>
+        <span class="rounded px-1.5 py-0.5 text-[10px] {STATUS_COLOR[item.status]}">
+          {STATUS_LABEL[item.status]}
+        </span>
+        <span class="text-slate-400">id #{item.id}</span>
+        <span class="text-slate-400">source: {item.source}</span>
+      </div>
+
+      <div class="space-y-3">
+        <label class="block">
+          <span class="block text-xs text-slate-500">제목</span>
+          <TextInput bind:value={editTitle} />
+        </label>
+
+        <label class="block">
+          <span class="block text-xs text-slate-500">설명 (markdown)</span>
+          <Textarea bind:value={editDescription} rows={4} />
+        </label>
+
+        {#if item.kind === 'task'}
+          <label class="block">
+            <span class="block text-xs text-slate-500">마감 (due_at)</span>
+            <input type="datetime-local" bind:value={editDueAt} class="rounded-md border border-slate-200 px-2 py-1 text-sm" />
+          </label>
+        {/if}
+
+        {#if item.kind === 'calendar_event' || item.kind === 'task'}
+          <div class="flex flex-wrap gap-3">
+            <label class="block">
+              <span class="block text-xs text-slate-500">시작 (start_at)</span>
+              <input type="datetime-local" bind:value={editStartAt} class="rounded-md border border-slate-200 px-2 py-1 text-sm" />
+            </label>
+            <label class="block">
+              <span class="block text-xs text-slate-500">종료 (end_at)</span>
+              <input type="datetime-local" bind:value={editEndAt} class="rounded-md border border-slate-200 px-2 py-1 text-sm" />
+            </label>
+          </div>
+          <label class="inline-flex items-center gap-2 text-sm">
+            <input type="checkbox" bind:checked={editAllDay} />
+            <span>all-day</span>
+          </label>
+        {/if}
+
+        <div class="flex flex-wrap gap-3">
+          <label class="block">
+            <span class="block text-xs text-slate-500">우선순위 (1–4)</span>
+            <input type="number" min="1" max="4" bind:value={editPriority} class="w-20 rounded-md border border-slate-200 px-2 py-1 text-sm" />
+          </label>
+          <label class="block">
+            <span class="block text-xs text-slate-500">프로젝트 태그</span>
+            <TextInput bind:value={editProjectTag} placeholder="(없음)" />
+          </label>
+        </div>
+      </div>
+
+      <div class="flex flex-wrap items-center justify-between gap-2 pt-2">
+        <div class="flex flex-wrap items-center gap-2">
+          {#if item.status !== 'done' && item.status !== 'cancelled' && item.kind !== 'activity_log'}
+            <Button variant="primary" size="sm" icon={Check} onclick={() => lifecycle('complete')}>완료</Button>
+            <Button variant="secondary" size="sm" icon={Pause} onclick={() => lifecycle('defer')}>연기</Button>
+            <Button variant="ghost" size="sm" icon={XIcon} onclick={() => lifecycle('cancel')}>취소</Button>
+          {:else if (item.status === 'done' || item.status === 'cancelled') && item.kind !== 'activity_log'}
+            <Button variant="secondary" size="sm" icon={RotateCcw} onclick={() => lifecycle('reactivate')}>재활성</Button>
+          {/if}
+        </div>
+        <Button variant="primary" size="sm" icon={Save} loading={saving} onclick={save}>저장</Button>
+      </div>
+    </Card>
+
+    <section class="space-y-2">
+      <h2 class="text-sm font-semibold text-slate-700">변경 이력</h2>
+      {#if history.length === 0}
+        <p class="text-sm text-slate-500">이력 없음</p>
+      {:else}
+        <ol class="space-y-1.5 border-l border-slate-200 pl-4">
+          {#each history as h (h.id)}
+            <li class="relative">
+              <span class="absolute -left-[21px] top-1.5 h-2 w-2 rounded-full bg-slate-300"></span>
+              <div class="text-xs text-slate-500">
+                {formatDateTimeKst(h.changed_at)} · {actorLabel(h.changed_by)}
+              </div>
+              <div class="text-sm">
+                {CHANGE_KIND_LABEL[h.change_kind] ?? h.change_kind}
+              </div>
+            </li>
+          {/each}
+        </ol>
+      {/if}
+    </section>
+  {/if}
+</div>
diff --git a/frontend/src/routes/events/new/+page.svelte b/frontend/src/routes/events/new/+page.svelte
new file mode 100644
index 0000000..b86093e
--- /dev/null
+++ b/frontend/src/routes/events/new/+page.svelte
@@ -0,0 +1,171 @@
+<script lang="ts">
+  import { goto } from '$app/navigation';
+  import { addToast } from '$lib/stores/toast';
+  import Button from '$lib/components/ui/Button.svelte';
+  import Card from '$lib/components/ui/Card.svelte';
+  import TextInput from '$lib/components/ui/TextInput.svelte';
+  import Textarea from '$lib/components/ui/Textarea.svelte';
+  import { ArrowLeft } from 'lucide-svelte';
+  import {
+    type EventKind,
+    type EventCreatePayload,
+    KIND_LABEL,
+    createEvent,
+  } from '$lib/utils/events';
+
+  let kind = $state<EventKind>('task');
+  let title = $state('');
+  let description = $state('');
+  let dueAt = $state('');
+  let startAt = $state('');
+  let endAt = $state('');
+  let allDay = $state(false);
+  let startedAt = $state('');
+  let endedAt = $state('');
+  let priority = $state<number | ''>('');
+  let projectTag = $state('');
+  let submitting = $state(false);
+
+  function localToIso(s: string): string | null {
+    if (!s) return null;
+    const d = new Date(s);
+    return isNaN(d.getTime()) ? null : d.toISOString();
+  }
+
+  async function submit() {
+    if (submitting) return;
+    if (!title.trim()) {
+      addToast('error', '제목을 입력하세요');
+      return;
+    }
+    submitting = true;
+    try {
+      const payload: EventCreatePayload = {
+        title: title.trim(),
+        kind,
+      };
+      if (description.trim()) payload.description = description.trim();
+      if (kind === 'task') {
+        if (dueAt) payload.due_at = localToIso(dueAt);
+        if (startAt) payload.start_at = localToIso(startAt);
+      } else if (kind === 'calendar_event') {
+        if (!startAt) {
+          addToast('error', 'calendar_event 는 시작 시간 필수');
+          submitting = false;
+          return;
+        }
+        payload.start_at = localToIso(startAt);
+        if (endAt) payload.end_at = localToIso(endAt);
+        payload.all_day = allDay;
+      } else if (kind === 'activity_log') {
+        if (startedAt) payload.started_at = localToIso(startedAt);
+        if (endedAt) payload.ended_at = localToIso(endedAt);
+        // 모두 비우면 서버 default (now())
+      }
+      if (priority !== '') payload.priority = Number(priority);
+      if (projectTag.trim()) payload.project_tag = projectTag.trim();
+
+      const item = await createEvent(payload);
+      addToast('success', '생성됨');
+      goto(`/events/${item.id}`);
+    } catch (err) {
+      const detail = (err as { detail?: string })?.detail ?? '생성 실패';
+      addToast('error', detail);
+    } finally {
+      submitting = false;
+    }
+  }
+</script>
+
+<svelte:head>
+  <title>새 events · hyungi PKM</title>
+</svelte:head>
+
+<div class="mx-auto max-w-xl space-y-4 px-4 py-6">
+  <div class="flex items-center gap-2">
+    <Button variant="ghost" size="sm" icon={ArrowLeft} href="/events" />
+    <h1 class="text-xl font-semibold">새 events</h1>
+  </div>
+
+  <Card class="space-y-4 p-4">
+    <div>
+      <span class="block text-xs text-slate-500">유형</span>
+      <div class="mt-1 flex gap-2">
+        {#each ['task', 'calendar_event', 'activity_log'] as k}
+          <button
+            type="button"
+            class="rounded-md border px-3 py-1.5 text-sm transition {kind === k ? 'border-indigo-500 bg-indigo-50 text-indigo-700' : 'border-slate-200 hover:bg-slate-50'}"
+            onclick={() => (kind = k as EventKind)}
+          >
+            {KIND_LABEL[k as EventKind]}
+          </button>
+        {/each}
+      </div>
+    </div>
+
+    <label class="block">
+      <span class="block text-xs text-slate-500">제목 *</span>
+      <TextInput bind:value={title} placeholder="할 일 / 일정 / 기록한 행동" />
+    </label>
+
+    <label class="block">
+      <span class="block text-xs text-slate-500">설명 (markdown, 선택)</span>
+      <Textarea bind:value={description} rows={3} />
+    </label>
+
+    {#if kind === 'task'}
+      <label class="block">
+        <span class="block text-xs text-slate-500">마감 (due_at, 선택)</span>
+        <input type="datetime-local" bind:value={dueAt} class="rounded-md border border-slate-200 px-2 py-1 text-sm" />
+      </label>
+      <label class="block">
+        <span class="block text-xs text-slate-500">시작 (start_at, 선택 — "14:00 전화" 같은 경우)</span>
+        <input type="datetime-local" bind:value={startAt} class="rounded-md border border-slate-200 px-2 py-1 text-sm" />
+      </label>
+    {:else if kind === 'calendar_event'}
+      <div class="flex flex-wrap gap-3">
+        <label class="block">
+          <span class="block text-xs text-slate-500">시작 (start_at) *</span>
+          <input type="datetime-local" bind:value={startAt} class="rounded-md border border-slate-200 px-2 py-1 text-sm" required />
+        </label>
+        <label class="block">
+          <span class="block text-xs text-slate-500">종료 (end_at, 선택)</span>
+          <input type="datetime-local" bind:value={endAt} class="rounded-md border border-slate-200 px-2 py-1 text-sm" />
+        </label>
+      </div>
+      <label class="inline-flex items-center gap-2 text-sm">
+        <input type="checkbox" bind:checked={allDay} />
+        <span>all-day</span>
+      </label>
+    {:else if kind === 'activity_log'}
+      <p class="text-xs text-slate-500">
+        비워두면 시작·종료 모두 <code>now()</code> 로 기록됩니다 (방금 한 일).
+      </p>
+      <div class="flex flex-wrap gap-3">
+        <label class="block">
+          <span class="block text-xs text-slate-500">시작 시각 (선택)</span>
+          <input type="datetime-local" bind:value={startedAt} class="rounded-md border border-slate-200 px-2 py-1 text-sm" />
+        </label>
+        <label class="block">
+          <span class="block text-xs text-slate-500">종료 시각 (선택)</span>
+          <input type="datetime-local" bind:value={endedAt} class="rounded-md border border-slate-200 px-2 py-1 text-sm" />
+        </label>
+      </div>
+    {/if}
+
+    <div class="flex flex-wrap gap-3">
+      <label class="block">
+        <span class="block text-xs text-slate-500">우선순위 (1–4)</span>
+        <input type="number" min="1" max="4" bind:value={priority} class="w-20 rounded-md border border-slate-200 px-2 py-1 text-sm" />
+      </label>
+      <label class="block">
+        <span class="block text-xs text-slate-500">프로젝트 태그</span>
+        <TextInput bind:value={projectTag} placeholder="예: doc-server" />
+      </label>
+    </div>
+
+    <div class="flex justify-end">
+      <Button variant="primary" size="md" loading={submitting} onclick={submit}>생성</Button>
+    </div>
+  </Card>
+</div>