When I was home over Christmas I asked Frank about the Quarterdeck (back room) on the Saturday. He doesn't manage the bar anymore, but said it might be okay. There's a guy doing food in the Quarterdeck nowadays, so I don't know the chances yet. I didn't get a chance to ask Grainne (Frank's daughter) as it was too busy when I was in over Christmas, but I've emailed them and am waiting for a reply.
An alternative to the Quarterdeck is the beauifully refurbished conservatory at the hostel, which has amazing acoustics and the bonus of cheaper drink as you get to bring your own! (Plus less distance to fall into bed, and no chances of being locked out! :)
(p.s. I will probably be partly present - now-ya-see-me, now-ya-don't - as my best friend is expecting her first baby and I'll be spending lots of quality girly time with her as I only get to see her when I make it over to Norn Iron.)