Flew a Cheyenne into there a few years ago, we showed up first thing in the morning, basically right when the airspace opened(think it was 8CDT). Was smooth and quick, minus the SeaKnight that cut infront of us twice. As far as the evening goes, not familiar there because you'll have a massive exodus of folks that showed up just for the day. Airspace opened around 6pm(this time is flexible due to performances etc..) normally, and a hard time closure of 8pm if I remember right.

Like I said, this was 2 yrs ago, so I have no real solid answers