I'm going to a dance tonight(for graduation) and I want to know what type of hairdo I should have... please he?

I just needa know whether to curl or straighten my hair tonight.. a few guys i like will be there...and also the one i want to rekindle a relationship with..:// also, you know, i think i'd like to look good!!! my hair is pretty long shiny and kinda thick blackish brown FYI