Is there an entry fee ?

Vestibule entry is free of charge. However, to see a performance, ticket must be purchased.

For most events, yes.

Yes

Depends on the event.

If you are looking for a tour, they do have one, and there is an entrance fee. But i think it's worth it.

They have some events that are free of charge....they'll let you know.....but most of the performances you must purchase a ticket or pick-up at window before the show starts...

See Gregg's answer.