Even if you file IFR, you're still going to be arriving VFR.

What should I bring for camping, food, and for the actual event?
Lots of money, sunscreen, plenty of water, good walking shoes and a tent that has been doubly waterproofed and can tolerate high winds. Earplugs also help when it comes time for the kerosene cowboys to do their stuff down at the flight line as well as for calling it a night earlier than everyone else.