I mean no disrespect to the OP but I think if you absolutely must have a seat you should consider bringing your own chair.
I have a Mom who also as mobility problems, when we take her to square on a night when there is an event or it real busy we take her wheel chair or a folding chair of our own. This ensure she has a seat and we look for one for ourselves when available.
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Mr. Grampy II
"How old would you be if you didn't know how old you are?" -Satchel Paige
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