Short answer
HubSpot's KB: the mobile meeting details page shows the agenda, attendees and related information, and you can edit it. The meeting must meet conditions listed in the KB to appear. AI prep needs at least one attendee with a contact record.
1. In HubSpot
The relevant screen in my demo portal.

2. Worth knowing
Check the KB's conditions if a meeting doesn't appear in the app.
3. Related
Calendar sync and scheduling pages.