As a child, about 45 years ago, I attended one of the Promenade concerts at the Albert Hall, folks sat around on the floor until it started, but were then required to stand up. As I was too small to see anything anyway I sat among the adult legs and heard the concert just the same, and my Mum (who at 5ft0ins could also see very little) came close to thumping the jobsworth who tried to stop me. I don't know whether they still enforce standing, I doubt they would get away with it now, but we never went as promenaders again.

A wheelchair requires space to stand, and I suppose that the organisers could just allow wheelchair users to be in among the rest. They would get the same view that any height-lacking person would have, the ultimate in non-discrimination, it could be argued. Please note that I do not advocate this, and would be surprised if no special arrangements were in hand. The whole idea seems based on the pop-concert model, but then that is what some of the new acts seem to want, I don't.