How do I find out if a park is closing early for a special event????

[jkcyoung]

I have a trip planned for a long weekend in Feb, and I just found out that the National High School Cheerleading Championships are the same weekend. My biggest concern is... I have ADR's at MGM on 2/11 and I read there is an event planned for the cheerleaders the same night with unlimited rides on tower of terror and Aerosmith. Do you think that these attractions will be closed to the general public or will they get acess after hours. This is the only day we are spending at MGM - should I change my plans?