I think they've been charging to park for as long as I've been going. I was there Friday, great weather, great racing, elbow-to-elbow seating so the place was packed.
I heard the place was sold again too, but like last time - we don't know. They moved the Nationals up a month to avoid the hurricane season. Guess what, it rained on Sunday, & Monday, and it's a torrential downpour right now on Tuesday. So, it looks like a reschedule is in order - maybe October when the air is awesome????