I had mine in MacTurcaills on Townsend Street. Great night, good area that you can reserve and the platters were plentiful and reasonably priced.
Going to a 30th in a few weeks in Messer Maguires on the Quays, apparently you can reserve one of the floors free of charge. I havent been before so cant comment but I've heard its an alright spot.
Phone some of yuor favourite joints and haggle with them. I think bars should be glad of a more or less guaranteed number of heads to buy drinks and should be delighted with the business.