You can just you cant use it during the show or they will take it but you can use it before and after the show or when you have the backstage tour.
I would call ahead as well, but in most situations they do not allow video cameras because someone could easily record the show and sell it without authorization. I have never seen someone take photographs during the performance, though.
Might want to call ahead. Most won't allow flash photography as it can be a problem to the performers
Probably depends on the event you're going to.
Thanks! Your answer is awaiting moderation.