I guess first and foremost, get together with your girlfriends and find out what they are wearing.
Consider your body type. Go with a cut that flatters you, and dont just wear something because all the other girls are, if it doesnt really do anything for you.
I'd go with something simple, classy and elegant, like this -
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I have fair skin, gray blue eyes, and used to have almost black-brown hair. That coral would look great, or even a royal or steel blue. I would wear nice earrings, do my hair up or back, and have a wrist free for a corsage. I would also wear a stable heel, not to high, and try to find an appropriate wristlet to carry essentials - probably silvery.
Ive always believed that less is more (less flash and frills), and since you will be dancing a lot, you dont want to wear something where you will need to be constantly checking whats showing, and making adjustments all night. The more comfortable you are, the more fun you will have.
You dont have to have your goodies hanging out to look and feel beautiful.