i dont have any recomendations for the evening hours, but i was at the races on may 24th and let me just warn you, security is a ball buster. They come check everty camp site, tell you too turn the music down once and the next time you are kicked out, no questions asked. we had no problem because we set our campsite up a ways off the roads, so we could see the trucks coming, we would turn the radio down and wait till they left. just letting you know not too party too hard or youll be kicked out.
as for evening hour entertainment, the bud girls might be there.