Join some local groups. Cali's are here . . . http://regionals.burningman.com/us_ca.html
You're in pretty much the Burner capital of the world, so you shouldn't have any trouble finding the like-minded . . .
Playa dust is very fine, like baby powder, and is very difficult to remove from nook & crannies, so don't bring any instrument you can't have cleaned (or better yet: better to think of it as your playa instrument for all eternity, really).
Like Elliot says, you can roam the city and play, or look for something structured in or out of a camp:2012 Art & Performanceviewforum.php?f=282