In general, we do like things to be predictable; but if you think about why that is--generally it's difficult to adjust on the fly to new situations--then paving the way for autistic people to enjoy a situation means informing them what's coming up. If I ran the movie theater, I'd hand out or display programs, like they do when you go to hear an orchestra perform, with times for everything and a clock posted somewhere so you could see what was coming up and when it was going to happen. I'd also have tickets that assigned seats, and people could reserve their seats ahead of time so they could always sit in the same seats. There would be a ban on perfume, and the seats would be far apart from each other so nobody would have to smell anybody else. And the movies that were going to be playing would be posted up ahead of time, along with the times they were going to show and when they would stop showing. Also, the snacks and drinks would always be the same, and what was available would be posted on a web site, with notices if they ran out of supplies or stopped selling something. You could go to the web site and order your snack and be given a receipt with a number on it, to print out, and trade it in for your food when you got to the movie theater. And if they had enough screens, they should only stop showing a movie when they had it come out on DVD, so whoever had been watching that movie could buy it and watch it at home instead.