[quote name='bertbass' timestamp='1479731177' post='3178759']
If it was me, I'd do your suggestion, try and set up oriented across the room and just "play to the room" and effectively ignore the rest of the pub - not even try to be heard out there? If the audience want to hear and see the band then they'll come to you.
[/quote]
Yep, that's what we do in that sort of situation. Next Wirebirds gig we are playing in the corridor leading to the toilets with a small in front of us in an otherwise large pub. We know it'll sound terrible if we turn up too far, so just play for those people near us and let the sound drift out to the rest of the place. Far from ideal, but not many pub gigs are, in my experience.