San Jose California said:
Or you could just not go since it's not that great.
But if you do, ask out all the hot teachers to prom. Just do it. You will look like the biggest player in the school. My friend asked a few teachers as a joke and they said no, not a big deal, you can do it too.
Or a little bit creepy...
Although, I have done that before (not exactly a dance but dates etc.) and it gets a good laugh out of the class but looking back on it I kind of laugh, but also think...that was kind of weird haha
But about asking think about this:
Which would you rather prefer? A girl who just walked up to you and said 'Want to go to the dance?', and then turned around and walked away.
Or
A girl who talked to you for a little bit/made you laugh/eased the ice a little and then asked you?
I guess it also depends on how good your friendship is too and how much you talk to her. Also I know at my school, for some of the dances it's the norm/you should ask the girl in a creative way by like putting it in a fortune cookie or something. For example, for one of our dances, one of my friends bought a pack of sweedish fish and tapped a letter on it that said something like 'Of all the fish of the sea, will you go to winters with me?' and left it at her locker or something.
So yeah, that's my basic thoughts...
Personally, I would just go talk to her for a lil, and then ask her.
good luck