How should I do my hair?

I am going to a church thing. Well it's just my 8th grade group and we are going to go to the church at 8:00 (it's 6:50 right now (here)) and we are playing capture the flag in the dark, eating pizza and watching a scary movie. The guy I like will be there (he has NO clue I like him) and iDK what to wear and do my hair lke. My hair is just below chin length and really sort wavy/curly! Should I satraighten it? What sort of thing should I wear????