Reference brisket Today at 00:40:
I went with a part of people who use wheelchairs some years ago to see The Rocky Horror Show. The wheelchairs were accomodated at the back of the auditorium. (Nearly) every time there was a musical number the whole audience stood up and sang along. None of the people in the wheelchairs were able to see the musical numbers, and various other parts of the show too. Difficult situation with no easy right/wrong answer.
Not just a problem for people in wheelchairs - something similar happened to my parents.
They were visiting me for a fortnight and as it was their anniversary during the stay, I got them tickets for a David Essex concert (a favourite of my Mum). I was vaguely aware that as the venue was a hall rather than a proper theatre, all the "stalls" seats were on the same level (apart from some seats at the back), but I was still buying proper "seats", and as it was only David Essex, I naively didn't think much of it.
Of course, when David came on stage, the whole audience stood up, and remained standing for the whole show. My parents found themselves behind a couple both well over 6 foot tall, and saw very little of the performance.
If I'd been there, I'd have tried to get my parents moved, but they "didn't want to cause a fuss".
It's always worth having a (very polite) word with a member of staff - ideally during an interval. After all, they want
everyone to enjoy the show - if nothing else to ensure that they'll consider coming back. If you don't consider your seats to be suitable, they're often able to find alternatives. I've had a chat with theatre managers on a few occasions, and have always found them accomodating.
Ultimately, the only real answer is "forewarned is forearmed". I made a mental note that the next time I bought tickets for that particular venue, I would either go for the raised area at the back, or else the circle.