I'd still say "most people", Surreysinger - "most" doesn't mean the same as "all", of course. Ideally a place with loots of bedroom available would be best, of course, but if that can't be found I still think a tent city round a building with lots of usable rooms and a couple of halls, and an option for indoor camping, could work well enough.

One thing that made the National special was the fact that there was just the one communal eating place, and the one bar. I wouldn't want that all the time everywhere, but it worked well, it kept things moving.

I'd think that there are a fair number of schools which could supply what's needed.