We were there this past April during 2 of the grad nites. No problems at all, in fact, it actually gave us a good reason to get out of the parks and call it an early night. We all desperately needed the break anyway -- just so much fun to be had!! It was kinda neat to ride the monorail and see all of the prep being done for the nite (lights, busses, detours, etc.) but none of it affected us!