It should be okay while using a cane they have small 1/2 person benches in addition to the seat cushion provided at the beginning so you're not forced to sit on the ground.
Chairs are available for those with disabilities
An additional FYI. It's a 35 minutes show that you watch seating or standing in the hall. It's not the traditional "art exhibition" that you need to walk through. HTH.
There's also a puttputt vehicle to take you up the ramp. Very accomodating.
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