If you have tickets already, call and speak to them. They will try to help you enjoy the show by getting you a seat you can use. I had a similar issue, broke my leg so i was on a walker and i called a week before the show. Ther moved me to a seat i can get to better. They were wonderful and very helpful.
Yes, people with a wheelchair and / or walker can enjoy the events, you must request assistance when you arrive.
Yes. There are good lifts and facilities, even for wheelchairs. I recommend buying tickets in boxes (Box) that are very broad and cheap.
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