How to Recruit Volunteers for Event Cleanup
Give cleanup its own shift on your free Proximatic signup. People who are busy earlier can take it, and you know who's staying before the first guest arrives.
Recruit a closing crew before the event begins. The people who worked all morning may need to leave, while someone who couldn't attend earlier may be happy to help pack away.
Put Cleanup on your Proximatic signup as a job in its own right. “Clear tables and return supplies, 3:30–4:30” gives a volunteer a task and a finish they can accept. Add the meeting point and closing lead so they know where to join the work when they arrive.
People can take that shift without promising to attend the whole event. Their names appear on the same roster as the opening and daytime crews, so you can see whether the room has people to close it as well as people to run it.
Check that closing crew while you're still recruiting. If the shift needs four people and two have taken it, share the two remaining places with the later start made clear. You can welcome fresh help at the end of the day instead of turning cleanup into an unexpected extension of everyone else's shift.
Create your event signup and recruit the cleanup crew before the day begins.