"I actually am under the impression that Kelsey always stage doors and signs and takes pics (at least from everyone I heard that went). I think it's the matinees that could be iffy, so avoid those though!"
Interesting. When I went on Friday, i went backstage with a friend in the cast. We passed Kelsey's dressing room and he had already left. When I went back outside, I asked someone if Kelsey had come out this door and they said no, he left through another door. I guess it was just that night.