Need help with party planning?!?! crush is coming over!?!?

so my dad is having a party and they both said i could have a small party of my own... i invited my friend and her bf and my other two single friends and my crush. So it really is small.. which isnt necessarily a bad thing! More time for us to be together! :) anyways im just trying to figure out what the heck to do... obviously we are already going to have plenty of food from my dad's party and they are giving me the whole bottom floor for my party. I just wasnt sure what to do to keep everyone amused... music? movies? just dance? (that would be fun... who doesn't love just dance?) but trying to figure out how long that would keep up amused for is the tricky part...

ok part 2! What do i wear... and what to do with my hair? if you have any fun hairstyles for longer hair that would be great! my hair is about 8 inches past my shoulder. please serious answers only! Thank you!