factor: The smoke. I know at least six people who would be on their way to the stadium right now if it weren't for the terrible smoke situation. It seems to be clearing up a bit now, but it is really, really hard on some fans' bodies.
I think attendance would've been a lot stronger if the air had been better.
For out-of-state CBers, it may be difficult to imagine why a little smoke might affect attendance. I'll clarify: We've been breathing this horrible air for MONTHS, now, and five hours of exposure is just too much at this stage.