We were given the option of remaining in the stroller/wheelchiar or using the benches. My DD is not autistic but has other issues, however, we opted to sit on the floor to enjoy the show. We were placed to the FAR right and actually this area seemed to be where most of the kids with disabilites were sitting. I will say this theatre is DARK, LOUD and Can be Chaotic. I would get a bench or stay in the stroller, wait until they close the doors and if you find a 'good' space to sit you can always move. We actually had no problems on the floor and sat near to a child with Severe Autism , his mother just let us know what he would possibly have problems with or do if he was over stimulated.. She was really nice .. he had no problems and they sat in the back and could always walk back to the wall if necessary. We are going back in August and plan the same strategy .. using the stroller until it fills then try to find a good place to enjoy from the floor. My DD has intractible Epilepsy, cognitive and visual intergration issues, an inoperable brain tumor , low immunity and suffers from low muscle tone and has coordination difficulties, she is especially sensitive to noise , darkness and sudden movements.. we had no problem sitting on the floor for this , she sat on my lap for the first few minutes then was ok to move off on her own.
I HTH...