I think I would avoid the convention! It won't be good for you at all. When I have been travelling with my kids and spouse, I often accompanied them places and waited for them in the car. They would go to a restaurant, and bring something out to the car for me. believe it or not, I was very happy (as happy as one can be with a brain injury!!!) in the car. If it is parked not pointing at bright streetlights, and it away from a lot of motion and traffic (a quiet part of a parking lot, for example), it can actually be a quiet place!
Maybe a strategy like that could help to do Some part of an outing.

You need to find things that work for you. Noise, lights, movement, multiple things happening...no good!

Hope you have a better day tomorrow!