Marilyn you pretty much said it all. And this is what I meant before about the paradox of "treat a Down's person like they're normal---but they're not normal" That's just it--if you can't sit in a theater and not be disruptive, then you really dont have a right to be in the theater.
My cousin is obsessed with the movie "Grease". He's so obsessed that for every holiday, all he wants is Grease on DVD. If you get him a present that's not Grease on DVD, he will throw it across the room and swear at you. (yes that's made for many shocking Christmas scenes) I bought him a window card and a t-shirt of the current Grease on b-way, but thankfully if he ever came here, he wouldn't even understand that Grease is a live musical and not the movie. And he'd prefer the dvd anyway--thank goodness.
But in response to some people who were saying that if a mentally impaired person wants to enjoy a show, should we prevent him? I really think that if a person as enough mental capability to understand there is a show on b-way and he/she wants to see it, then that person will probably have enough capability to understand that if they talk, they'll have to leave.