I can't speak to how many people tailgate beyond kickoff b/c I'm inside. wouldn't know if people are given a choice of going inside or leaving lot after the game starts (some places do). But, gut feeling, when I return to the lot it seems like a lot of people there never came in. Would not be in favor of a strict "Game or Go" policy in lots but maybe there's a gentler way to coax folks to come on in.As to the attendance I got to blue lot at 11:30 and it was completely full and they pushed me all the way to grey lot.
Not sure how many went inside but the parking lots were jammed.