Can't underplay how much the grass lots being closed effected the number of people in town for the game. I had many friends who didn't come up because they didn't know where to tailgate without the grass lots.
I think that this had a big impact on students also. Many stayed on campus or at their apartments because they couldn't have their typical tailgates near the stadium. It is a lot easier to stumble across the street to the game than to navigate riding the bus.