Yeah, you should dress appropriately. I'm thinking hawaii shirt, gold chain, cargo pants, and your greener birkenstocks. Fill the pockets on your cargo pants with candy for the show.

It is not inappropriate to boo, if one of the ballerinas makes a misstep. You paid for those tickets, you have the right to boo. Also, if there is a hot ballerina, I sometimes yell "Take it off!", don't do that if the program says they are under 18 though. That is just creepy.