Can't say for sure about the Little Rock venue but when they were in Springfield the admission was free for spectators. There was a $20 charge if you wanted to bring your car in and be a part of the show (which we elected to do).
The times they gave us were Noon to 8 PM and the long haulers arrived throughout that time period. Being the final day, I would expect a big turnout, and a party atmosphere............... although some of the folks will undoubtably be plum wore-out!
Check your local radio stations. They advertised it heavily here.