See? No need to get angry, and I'm sure you probably had a hangover the next morning. And it wasn't dumb of you at all. Boys are dumb and usually drive us pretty crazy yet we can't seem to live without them.
I wouldn't get your hopes up too high for that one then. Unless the late teens are suddenly all going for monogamy here.
Sounds like a good time. Maybe not the first weekend out of school, but the one after? It's a little more time to plan things out? Unless you think someone is going to try and throw one right after. That just doesn't seem intelligent when there's pre-wedding things that are going to rob you of guests.