I stage-doored a matinee and pretty much everyone came out. The only person who didn't stop to sign was Patrick Page, probably in a hurry to get dinner before the evening show. It was kinda crowded, particularly at the place where the barricade stopped, but not crazy.
I'd recommend learning some basic words/phrases in ASL to communicate with the deaf actors. Andy Mientus did a segment in his vlog showing different useful phrases for the stage-door:
https://www.youtube.com/watch?v=I2A6CWv6U8o 7:42