Just because you've not been there before doesn't mean you have to look like a doofus. If you enjoy the EDM scene, do some research before you get to the event. At the very least, find out what genre within the EDM umbrella that you like, and see which DJs at said festival will be playing it. That's not to say that you should expect your at-home playlist to be heard during the event, but having a passing knowledge of who's playing will help you leaps and bounds, especially if you meet someone who's a) more knowledgeable than you and b) cool enough to school you on said DJs or genre.