Plan a run of show backwards from the end time

Steps

1. 1 Guest Open the public host application form 0:01 ▣

   No account needed to START pitching a night — the account is asked for at the very end, once the host knows what they are signing up for. Everything about the schedule below is asked from scratch.

2. 2 Guest Who is asking, and for what 0:02
3. 3 Guest Pick the event date from the calendar 0:03 ▣

   Saturday 17 April 2027. This is the EVENT day — which is not the same as the calendar day every part of the night falls on, and that difference is the whole point of what follows.

4. 4 Guest When does the night end? 0:04

   The only anchor the host gives. Everything else is a DURATION, and the schedule is walked backwards from here.

5. 5 Guest …Midnight 0:05 ▣
6. 6 Guest How long does the headliner play? 0:07
7. 7 Guest …2 hours 0:08
8. 8 Guest How long is clean-up? 0:09

   The only step that moves FORWARD from the end time.

9. 9 Guest …1 hour 0:10
10. 10 Guest How long do the openers play? 0:12
11. 11 Guest …1 hour 0:13
12. 12 Guest How long is setup? 0:14
13. 13 Guest …1 hour 0:15
14. 14 Guest How long before the first act do doors open? 0:17
15. 15 Guest …30 min 0:18
16. 16 Guest The run of show derives itself 0:19 ▣

    Nobody typed a timestamp. Doors 8:30 PM, first act 9 PM, headliner 10 PM, last note at midnight — which is already the 18th, so the card says so out loud.

17. 17 Guest Same night, one answer different: it runs to sunrise instead. 0:22

    Anything before the 6am rollover still counts as the same night, so 'Saturday, ends at 6 AM' means Saturday MORNING — and the run of show has to walk backwards through midnight to get there.

18. 18 Guest Change the end time 0:24

    No preset says 6 AM, so this is the free-entry branch. It is still a wall clock, not a timestamp — the host never sees UTC.

19. 19 Guest …none of the presets fit: Other… 0:25
20. 20 Guest …6:00 AM 0:26 ▣

    Typed into the free-entry box, the group commits and collapses exactly like a preset — and the SERVER sends back the canonical label.

21. 21 Guest The openers play longer 0:29
22. 22 Guest …2 hours 0:30
23. 23 Guest Setup takes longer too 0:31
24. 24 Guest …2 hours 0:32
25. 25 Guest Doors open an hour before the first act 0:34
26. 26 Guest …1 hour 0:35
27. 27 Guest Load-in lands on the PREVIOUS evening 0:36 ▣ ✕

    Setup 11 PM Friday → doors 1 AM → first act 2 AM → last note 6 AM Saturday. The clock crosses midnight in the middle of the run of show and the schedule is still in order, because every hop is arithmetic on absolute instants, never on the wall clock.