Calendar V5: game nights, RSVPs and availability built into the calendar, as signed #837

What

The signed "Calendar V5 · game nights" mockup (approved 2026-09-27) puts game nights on a real-world calendar inside the calendar itself. One RSVP system replaces the separate pieces the old calendar and the sessions plugin had. None of it is built yet; this issue is the to-do.

From the mockup:

• RSVP in the day's card: each game night's box has its RSVP:

  • Yes / Maybe / No;
  • a count;
  • a roster with each person's answer and note.

  Silence shows as "no answer yet", never as a no. The event's full page shows the same.

• Availability: each member paints the hours they can play. It repeats every week, in their own time zone.

• Everyone's local time: times show in the viewer's own zone. Until they set one, they show in the calendar's zone, labelled like CDT.

• Personal calendar links: a person's link holds only what they can see: game nights and who's away. Director-only plans never go into anyone's link, and answers and notes stay on Chronicle. This overlaps Give each player a revocable calendar feed (.ics) of game sessions #636.

• Motion and cards: the same fold-out day card and event page as the rest of V5.

The operator's recorded answers when signing (the questions are on the sign-offs page):

• "Yes, on for every campaign, and the owner can switch it off"
• "The four seasons of its zone's half of the world"
• "Yes, like any member, with a switch to leave themselves out"
• "The calendar's own zone, labelled like CDT, with the browser's zone offered in one press"

Where

• The old RSVP wiring is still cut. internal/app/routes.go has CALV5-PLACEHOLDER notes for:

  • the RSVP repository, service and handler, and calendar.RegisterRSVPRoutes;
  • the sessions setters (SetRSVPNotifier, SetAvailabilityWriter, SetScheduleReader, SetOwnWeekReader).

  Rebuild them to this design rather than restoring the old UI. This is the RSVP part of Calendar V5: reconnect everything the rebuild cut off (AI tools, backups, import/export, Foundry, diagnostics), and clean up what's left #778.

• Data: the RSVP table (calendar_event_rsvps); check whether V5 keeps it before building on it.

• The sessions plugin: game nights, reminders and the availability grid.

Done when

• RSVPs: a game night takes RSVPs in the day's card and on its page, as in the mockup.
• Players: a player sees only what they may. This is checked with a player account.
• Availability and time zones: availability painting and everyone's local time work as signed.
• Links: personal calendar links follow the rule above.
• Live checks: the checks in Check on the live site: session reminders, RSVPs and the availability grid #736 and Check: availability and game-night views stay readable with five or more players on one day #815 pass on the live site.