With things being so vague, the potential for us to be bumped at short notice being so high and the lack of adequate space in the restaurant when all groups are present, I think my group is going to have to (reluctantly) forgo the pub for the duration of this apparently vital event. There simply isn't enough room in the restaurant to accommodate everything needed when there are more than two groups in attendance, and coupled with the noise to proximity ratio, makes playing our current campaign events untenable. We'll be playing via Google hang-outs until we can get back to normal.
Good luck to everyone else!