Yes most likely, but you actually need to call and speak to someone there though.
The wait staff is part of the show. You should order the food and drinks if they will be more than an hour late.
People were able to come and go out during the show as the restrooms were outside the show doors. However, they do close the box office but I'm not sure how long after the show starts.
My guess is yes but I'd call them to make sure
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