I would get there about an hour and a half there is usually a lot of walking. Then security, then walking and finding your seat. But the concerts are well worth it. If you get there at 4 you can tail gate and that's a lot of fun too...
Parking lot opens at 4 PM. If you have to walk or take shuttle bus from your parking spot to the Center, leave yourself about an hour to do that.
I like to get there an hour before. Need to go through security check. You may have shore traffic to contend with Thurs-Sun. Enjoy.
At least an hour before the show or more if you have the time.
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