WE are there most every year during GradBAsh. The BAsh does not start until the park is closed, as it is for grad bash participants (students&chaperones only) Their tickets do not alllow admission to the parks before 7pm. I never noticed anything unusual as far as long lines or anything like that. You wouldn't even know there was a GradBAsh as they keep the event completely seperate....I do think the only thing you will notice a crowd is CityWalk as there is a pre party there but that is not until late afternoon/early evening before the bash.