In response...

...to Mister Carlo: well duuuuuh! I know that. Been there many times before. The kids actually confide in me the elaborate details of their after-soirées. They ask me if I have connections to great deals with the hotel for rooms (as if!). They discuss ad nauseam limo rentals, tux and dress purchases and the vast quantities of alcohol they intend on consuming...

They are also, I would like to stress, keenly aware of what is planned for the event. These kids are part of the frickin' grad committee, for cryin' out loud. So they know fully well that I have booked the hall, the DJ, the security guard until midnight. If they weren't thinking with their belly buttons (and, I'll admit, most teens have their brains planted either in their crotch or navel), they would have agreed to having the hall and DJ and other stuff for half an evening...Dinner, minus the dance.