I just watched The Blues Brothers in an open air cinema in Interlaken, Switzerland. It was a cinema built in a square on the main street. Free with a bar.
They lend blankets for you to put on the chair or cover yourself if you are cold. Some people came with their own cushions. I suppose they are regulars.
On top of that all the bar staff were dressing as the Blues brothers and so people too. Others just Blues Brothers t-shirts. During the movie people would laugh really loud, cheer, shout.
It was quite an experience.