Stage Lighting And Effects Equipment

So I'm having a dance party. In the theme of the movie's "New Moon, and Twilight" sort've.
I already have most things planned for the decorations. Like posters of the characters, strobe lights, disco mirror balls, and a disco light, and im hanging CD's from the ceiling! and twinkly star's. and i'm going to have a black light, with neon curtains around the walls of the whole room.
It's going to be a good four hour's and most people won't dance that whole time. It's a boy and girl party.I need some good games to play that aren't little kids games and aren't corny. Like I don't want anything like musical chairs, or tag, or any of that littler kid's stuff.
And no trivial games or stuff like that. I'm inviting about 50 people, so no things that require like up to 6 people!
I'm sorry I know this is a hard question, haha. (:
If anybody has any game idea's, it would be greatly appreciated, thanks!