Good first step on the events for bomb parties. However, one important piece of information that should be conspicuously declared is the specific floor on which the bomb party takes place. Probably should be its own field.

While it is, perhaps for the host's convenience and security, said floor should be closed automatically when the auction is won, and then opened automatically at the moment the party starts. If they want to do a second floor in their time slot, as much as it's their prerogative, it would also be their responsibility. Obviously an override could be available, but with a confirmation prompt when opening early.