What window? You mean online? Or walk up? On the day of the show? If other seats are available, many shows are sold out in advance so this might not be possible unless you would be willing to settle for balcony seating. If you are trading far enough in advance, preferred seating assignments might be available.
Yes I did this year because I got the flu so went at a later date. Call them and they can arrange it hopefully.
Yes you can
I'm not sure, you would have to check up front.
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