Need help with a party need best answers!!!!!?

ok well im having a boy girl backyard party and i need a theme where i can dress nice to impress bois but comfortable and so...need a theme please please i need a theme to go with virgin daqaries and sparkling cider and finger food ( those triangle finger sandwhices to b exact!!) well anyways please please help this has to be HUGE i want ppl to remember it and i need a dress code if i already didnt say that and ummmm i need invitation ideas please pelase help!!!!!! o yea and we will b dancing and i wanna blast mi music but i cant with neighbors please please please please help im desperate this party has 2 rock!!!