diff --git a/lib/demo/__tests__/fixtures.test.ts b/lib/demo/__tests__/fixtures.test.ts
index a8d80dbca..093ead4f9 100644
--- a/lib/demo/__tests__/fixtures.test.ts
+++ b/lib/demo/__tests__/fixtures.test.ts
@@ -334,4 +334,16 @@ describe('demo fixtures: audience screenshots', () => {
       title: 'Engineering Lead', department: 'Platform', phone: '+49 30 555 0199', mobile: '',
     });
   });
+
+  it('the out-of-office reply is on for the Lisbon days on the calendar', async () => {
+    const reply = await new DemoJMAPClient('work').getVacationResponse();
+    expect(reply.isEnabled).toBe(true);
+    const trip = work.calendarEvents.find((e) => e.id === 'demo-event-lisbon')!;
+    const from = new Date(reply.fromDate!).getTime();
+    const to = new Date(reply.toDate!).getTime();
+    expect(from).toBeLessThan(to);
+    expect(from).toBeGreaterThanOrEqual(new Date(trip.utcStart!).getTime());
+    expect(to).toBeLessThanOrEqual(new Date(trip.utcEnd!).getTime());
+    expect(reply.textBody).toContain('Lisbon');
+  });
 });
diff --git a/lib/demo/fixtures/vacation.ts b/lib/demo/fixtures/vacation.ts
index 927f1a844..3d1d92fd1 100644
--- a/lib/demo/fixtures/vacation.ts
+++ b/lib/demo/fixtures/vacation.ts
@@ -1,13 +1,16 @@
 import type { VacationResponse } from '@/lib/jmap/types';
-import { demoDate } from '../demo-utils';
+import { demoAt } from '../demo-utils';
 
-/** Prepared for the Lisbon trip, not switched on yet. */
+/**
+ * Switched on for the Lisbon trip (Infra Summit in fixtures/calendars.ts,
+ * days 9 to 12): from the morning flight out to the evening flight back.
+ */
 export function createDemoVacationResponse(): VacationResponse {
   return {
     id: 'singleton',
-    isEnabled: false,
-    fromDate: demoDate(9, 0),
-    toDate: demoDate(13, 0),
+    isEnabled: true,
+    fromDate: demoAt(9, 6),
+    toDate: demoAt(12, 22),
     subject: 'Out of office: back next week',
     textBody: 'Thank you for your mail. I am at Infra Summit in Lisbon and reading mail slowly until next week.\n\nFor anything about the Beacon launch, Alice Johnson (alice.johnson@meridianlabs.example) has the plan. For customer questions, support@meridianlabs.example answers within a business day.\n\nNora',
     htmlBody: '<p>Thank you for your mail. I am at Infra Summit in Lisbon and reading mail slowly until next week.</p><p>For anything about the Beacon launch, <a href="mailto:alice.johnson@meridianlabs.example">Alice Johnson</a> has the plan. For customer questions, <a href="mailto:support@meridianlabs.example">support@meridianlabs.example</a> answers within a business day.</p><p>Nora</p>',