I've never done a Worldcon before, and I was pretty annoyed at the lack of elevator staffing. Having seen at least two people with walkers get shoved aside and somebody on a scooter just being ignored--that's just so unacceptable you can't see acceptable from there. Con-goers were trying to do their best on the "Hey, let's make room here..." but some people are so damn oblivious and you can't physically haul them out of the elevator for being a dick. (Well, I can't.)

I do a number of cons, and year after year, con after con, the thing I really notice is "Do you have somebody from security manning the elevators? Why the hell not?" It can't fix a lot of these issues, but it makes life a lot easier.