I remember from charlotte on elevation that there was an 11 oclock curfew. I don't know if that is still in effect in charlotte at the new arena- if so they may be on in the 8:45 range.
They have been hitting the stage anywhere between 9pm and 9:30pm. At both Vegas shows they were more toward 9:30. As soon as you hear Wake Up by Arcade Fire, the show's about to start.