What can you do with your hair for your dance?

You can do pretty much anything you want. What might look best depends on the type of dance you are doing. If it is ballet usually a classic ballet bun is good but sometimes a choreographer wants your hair down. In contemporary your hair can be however you want it, up/down, I've had my hair in a messy bun for a contemporary piece before. Its just whatever the Choreographer feels looks best with the piece as a whole.