I have to agree with Andy on this Ken. I actually don't drink or smoke, and I would love to go to a nighter that had no bar, and a smoking ban. Unfortunately I would probably be the only one there.
On a serious note, the people who own the venues are business men/women and all they are interested in is how much money they can make. If you tried to run a nighter without a bar, my guess is that the room owner would want all the door takings. So no money for the DJ's or the promoter. And to be honest, I don't think most people would turn up. The first thing I'm asked, is usually, "what time is the bar is open till"
So yes, I would support a nighter with no bar, but, the only things that matter to me are the quality of the music, and the sound system. Get those right and nothing else matters to me.
Phil.