There's no way of knowing yet, so all this conjecture is pointless. We don't know how hard rush will be yet because no one has reported back thus far, we haven't seen the weekly grosses yet, and the reviews haven't come out yet. If the show gets raves and turns into a smash hit, it would be difficult. If you see this week that the theatre was 30% full, there won't be much of a problem. December 15 is 16 days away. Just wait and see. There's no point in getting all anxiety ridden now.
But I do know that the show is selling very well.
"If you are going to do something, do it well. And leave something witchy."
-Charlie Manson