[JakeGinnivan]

Summary

Building an agenda closes once the conference is over. People who already picked talks keep their link to /agenda/my; everyone else stops seeing it.

 agenda loader (current year, published, Sessionize)
-  canPick = published && current year
+  hasMyAgenda    = published && current year
+  canPick        = hasMyAgenda && conferenceState !== 'conference-over'
+  myAgendaClosed = hasMyAgenda && !canPick

 <Agenda>
-  {canPick && <MyAgendaLink />}
+  {(canPick || (myAgendaClosed && picked.length > 0)) && <MyAgendaLink />}
   <TalkCard pickable={canPick ? talk : undefined} />   // + buttons gone after the day

	Before the day / on the day	After the day	Previous years
+ buttons	✅	—	—
"My agenda" link	✅	only if this browser has picks	—

/agenda/my still lists existing picks and exports the .ics. Its empty state after the conference now says the conference is over instead of telling people to use a + button that no longer exists.

Evidence

New e2e cases in e2e/my-agenda.spec.ts. They set the date override to 2026-10-10, a week after the fixture conference:

after the conference
  ✓ the agenda offers no picker, and no link when nothing was picked
  ✓ someone who built an agenda can still get to it        // pick on 2026-09-01, reload on 2026-10-10 → "My agenda (1)"
  ✓ the personal agenda says it is over when nothing was picked

• Before: after the conference, the + buttons and the "My agenda" link still showed for everyone.
• After: my-agenda.spec.ts + date-states.spec.ts, chromium and chromium-light: 34 passed.

Merge Danger

Door: two-way

Only a loader flag and conditional rendering change. Picks in localStorage aren't touched, so reverting brings everything back as it was.

Blast Radius: small

It only affects the current year's /agenda and /agenda/my once the conference-over state starts, which is the day after the conference. /api/agenda/shortlist is unchanged and still accepts POSTs after the conference, but the UI no longer sends any adds.