What happens next?

How to dress for a dressy middle school dance
Get an outfit!
Cute dresses usually work for this kind of event. Definitely get something age appropriate. Remember this is a middle school dance and you're 11 , 12 , 13, or 14, not 21 and you're not going clubbing! If your school has a dress code, be sure to follow it.
You could also get a cute flowy shirt and skirt or nice pants. Find something that compliments your shape and skin/eye color.