Camp next to your plane. Seriously.

I've been to OSH 32 times. The first 17 times, I stayed off-field, and *thought* I was attending the convention.

What I didn't know -- couldn't, really -- is that Oshkosh begins after the airspace shuts down, and the parking lots empty.

Get yourself one of the new, 12" thick inflatable queen sized mattresses, and a decent tent. These new beds are more comfy than any dorm bed, and you'll be right in the thick of things.