One organizer collects a share from everyone chipping in, into one visible place, and the venue, catering, and decorations come out of that table. Collect before you book so nobody fronts the deposit.
A graduation party often has a few families or friends going in together: a venue, catering, a photographer, decorations, all landing at once. One person ends up booking it and fronting the deposits, then collecting from everyone else in the weeks around a busy graduation season when nobody's checking their messages.
A graduation party has a long tail: the extra tables, the cake, the day-of supply run, sometimes a group gift for the grad on top of the party. Instead of one person fronting each one, collect a little extra into the table so those come out of shared money too.
Whoever pays for a party cost requests that amount from the table, the organizer approves it, and everyone sees it come out. Nobody keeps a side tally during a busy season, and the leftover is on the record to send back or put toward the grad's gift. (Combining it with a milestone birthday the same summer? See collecting for a group birthday party.)
The organizer holds the money the way one person always does, only now everyone sees every dollar. It goes to the organizer; TableCash never holds it and is just the record.
Family and friends all want to throw the grad a party, but the hall, the caterer, and the photographer need money before the day. Get everyone committed first. Each person saves a card and promises their share now, and no card runs yet.
The cards don't charge until enough people are in for the party to actually happen, then they all go at once, so nobody fronts the venue and nobody can silently back out. It's soft while the table fills, so a person can take it back with nothing charged, and binding once it fills. Here's how to commit-now-pay-later instead of covering it yourself.
A group fund with one person in charge.
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