They have a place in front of the barricade that is open for wheelchair seating. They will give you a chair so you can sit with your husband. I'd just ask security for accomodations when you get there, they are always outside before shows.
They allow wheelchairs to stay up front off to the side.
As far as I know there isn't any seating in any of the venues. I'd call the box office and make sure the elevator in the parking deck is working. Not saying it doesn't work, just haven't seen anyone use it.
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