That's what I was thinking, but some people do that in the pits at the Chili Bowl too;
I can't help ya with parking, I live close enough that I can walk in...
Seriously your best bet is to see how close to the track you can get in the surrounding neighborhoods; I'm pretty sure people sell lawn space like they do for the 500, and you can probably find a spot for $10.00, where the track is charging 20 (I'm not close enough for parking, just close enough to walk myself).