well, now you mention it, I was in Nenthead last week and I am sure I saw something like that.... or maybe I was just hallucinating???
on the serious side though, if you got a projector and a generator (mere details!) the Ballroom would be a fab place to watch a film- bet the acoustics would be good too, as long as it didn't bring the 100 year old rotting timber down in the surrounding passages!