I went to an AMC Theatre last week and amazingly the room was absolutely trashed after the movie. For only maybe 25 people in the room.

Concert two weeks ago, same thing. The venue was full of garbaghe. It is really amazing how great most burtners are about those principles. For my camp at least we spend a solid 3 or 4 hours before leaving to rake our whole area and make sure we don't leave anything behind. Most people do the same.