diff --git a/CHANGELOG.md b/CHANGELOG.md
index 386461d..63f7e94 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -33,6 +33,10 @@ All notable changes are documented here. Format based on [Keep a Changelog](http
   and export controls (#555)
 - `/stream/[id]` — **PDF** button triggers `window.print()` to produce a formatted single-stream
   summary document via the print stylesheet; actions and back-link hidden in print view (#571)
+- `/stream/[id]` — **Calendar** button downloads a standard `.ics` invitation for the stream's
+  end date (one-hour event, one-hour reminder, deterministic UID so re-importing updates the
+  existing entry instead of duplicating it), built by the new `lib/calendar.ts`; rendered only
+  for bounded streams, since an open-ended stream has no end date to schedule (#566)
 - `app/globals.css` — `@media print` block scoped to `.print-receipt` class: resets body
   to white/black, collapses table borders, hides interactive chrome, preserves monospace
   addresses and amounts, renders status badges in monochrome, adds a print footer with the
diff --git a/__mocks__/lucide-react.tsx b/__mocks__/lucide-react.tsx
index 7821913..9779f72 100644
--- a/__mocks__/lucide-react.tsx
+++ b/__mocks__/lucide-react.tsx
@@ -28,6 +28,7 @@ export const AlertCircle   = createIconStub('AlertCircle');
 export const ArrowDownToLine = createIconStub('ArrowDownToLine');
 export const ArrowLeft     = createIconStub('ArrowLeft');
 export const ArrowRight    = createIconStub('ArrowRight');
+export const CalendarPlus  = createIconStub('CalendarPlus');
 export const Check         = createIconStub('Check');
 export const CheckCircle   = createIconStub('CheckCircle');
 export const Clock         = createIconStub('Clock');
diff --git a/app/stream/[id]/__tests__/page.test.tsx b/app/stream/[id]/__tests__/page.test.tsx
index 3078d67..69f3c99 100644
--- a/app/stream/[id]/__tests__/page.test.tsx
+++ b/app/stream/[id]/__tests__/page.test.tsx
@@ -45,6 +45,14 @@ vi.mock('@/components/stream/StreamActions', () => ({
   StreamActions: ({ token }: { token: string }) =>
     React.createElement('div', { 'data-testid': 'stream-actions' }, token),
 }));
+vi.mock('@/components/stream/AddToCalendarButton', () => ({
+  AddToCalendarButton: ({ streamId, endTime }: { streamId: string; endTime: number }) =>
+    React.createElement('div', {
+      'data-testid': 'add-to-calendar',
+      'data-stream-id': streamId,
+      'data-end-time': String(endTime),
+    }),
+}));
 
 import { useWallet } from '@/contexts/WalletContext';
 import { getStreamAddress, getStreamInfo, getWithdrawable } from '@/lib/stream';
@@ -269,4 +277,46 @@ describe('StreamPage (app/stream/[id]/page.tsx)', () => {
     // silently stale "active" state from the first request.
     expect(container.querySelector('[data-testid="badge"]')?.textContent).toBe('cancelled');
   });
+
+  it('#566 — offers the calendar action with the stream end date when the stream is bounded', async () => {
+    mockUseWallet.mockReturnValue({
+      publicKey: 'GRECIPIENT',
+      connected: true,
+    } as unknown as ReturnType<typeof useWallet>);
+    mockAddr.mockResolvedValue('STREAM_ADDR');
+    const endTime = Math.floor(Date.now() / 1000) + 3600;
+    mockInfo.mockResolvedValue(makeInfo({ endTime }));
+    mockWithdrawable.mockResolvedValue(0n);
+
+    await act(async () => {
+      root.render(React.createElement(StreamPage));
+      await Promise.resolve();
+      await Promise.resolve();
+      await Promise.resolve();
+    });
+
+    const action = container.querySelector('[data-testid="add-to-calendar"]');
+    expect(action).not.toBeNull();
+    expect(action?.getAttribute('data-stream-id')).toBe('42');
+    expect(action?.getAttribute('data-end-time')).toBe(String(endTime));
+  });
+
+  it('#566 — omits the calendar action for an open-ended stream (nothing to schedule)', async () => {
+    mockUseWallet.mockReturnValue({
+      publicKey: 'GRECIPIENT',
+      connected: true,
+    } as unknown as ReturnType<typeof useWallet>);
+    mockAddr.mockResolvedValue('STREAM_ADDR');
+    mockInfo.mockResolvedValue(makeInfo({ endTime: 0 }));
+    mockWithdrawable.mockResolvedValue(0n);
+
+    await act(async () => {
+      root.render(React.createElement(StreamPage));
+      await Promise.resolve();
+      await Promise.resolve();
+      await Promise.resolve();
+    });
+
+    expect(container.querySelector('[data-testid="add-to-calendar"]')).toBeNull();
+  });
 });
diff --git a/app/stream/[id]/page.tsx b/app/stream/[id]/page.tsx
index 29f338f..fde07fb 100644
--- a/app/stream/[id]/page.tsx
+++ b/app/stream/[id]/page.tsx
@@ -16,6 +16,7 @@ import { StreamActions } from "@/components/stream/StreamActions";
 import { AddToCalendarButton } from "@/components/stream/AddToCalendarButton";
 import { OperatorInfo } from "@/components/stream/OperatorInfo";
 import { StreamNoteEditor } from "@/components/stream/StreamNoteEditor";
+import { AddToCalendarButton } from "@/components/stream/AddToCalendarButton";
 import { useWallet } from "@/contexts/WalletContext";
 import { useStreamNote } from "@/hooks/useStreamNote";
 import {
@@ -324,6 +325,17 @@ export default function StreamPage() {
             <FileText className="w-3.5 h-3.5" aria-hidden="true" />
             PDF
           </button>
+          {/* Add the stream's end date to an external calendar (#566) — only
+              bounded streams have an end date to schedule. */}
+          {info.endTime > 0 && (
+            <AddToCalendarButton
+              streamId={id}
+              endTime={info.endTime}
+              startTime={info.startTime}
+              streamAddress={streamAddress}
+              tokenSymbol={tokenSymbol}
+            />
+          )}
         </div>
       </div>