I get the growing impression that you'll have to have the final say on the format, Geoff. We've never run anything this size before, and we will obviously have to do it in a way that suits you and owner of the B&C if, as you say, we want to hold any more.
If we have a self-service beer area/table, we could do it in two shifts, with the pale beers replaced by the dark beers at 9 or 9.30 (assuming there's any left).
Might that work?