Since Weird Al's concert is this saturday, I was wondering how crowded the main park will be during the evening hours mainly from 4 to close. During other concerts are the crowds still riding the roller coasters light? Any info would be appreciated. Thanks in advance.

The park will be just overall more crowded. I imagine you'll see a much bigger impact after 5pm since they have the Twilight Sale + Concert package available. Of course, most people will be at the concert by 7:30, but it seems as thought the nights of concerts are typically more crowded regardless.

ok, I might just skip out on going saturday and go early next week then

I'm no expert, but I imagine the park will be dead since most schools are back in by then. That may be a better choice for you.