SaritaSyrah, when you arrive at the event, there are at least two stops:
Gate - where they tear your ticket and look briefly for stowaways in your vehicle. This stop is strictly business.
Greeters - this is an area beyond Gate, where lighthearted folks will give you a What/When/Where
guide (a book of planned programming) a map, last-minute advice, etc. (I believe PolyParadise is the camp that has the Human Carcass Wash.) I recommend looking for events in the W/W/W, early in the week, although you'll probably find yourself doing completely different stuff anyway.
Before you actually get to the event, you can check the 2012 Theme Camps
and 2012 Art & Performance
forums here on ePlaya, particularly in June or July, once theme camps get placed and know what their addresses will be. There is also a link at the top of the main site called "Theme Camps", which will have a list of camps and their contact information. 2012 Theme Camps aren't listed yet, but here's a sample of what was there last year:http://www.burningman.com/themecamps/11_camp_vill.html
It can be fun to know whats going on in advance in case you like to have a costume for a certain something. Last year I compiled a list of some specific camps, their addresses, and the days on which they were having various events. I only made it to a few, but I liked having the information with me.