This has been a fascinating read for me, I left right after high school (mid 60's) No mikes or cords to those not on the stage.... The last time I was in a Hall was for a funeral. I do belong to a church these days and know they are pro-active about injury and carry insurance for such. Cost of "doing business" Laws require it.
If those in charge had shown concern and made an effort to keep things clear afterwards I doubt that any suit would have been considered. When I worked in a hospital we couldn't store wheelchairs at the end of a hall or outside a room. Fire code inspections are regular (at least annual) and we were all required to be aware of violations.