My advice:
If you come to Ireland, hold it in Dublin, and for heaven's sake CHARGE for it. Nobody would complain about a tenner in (they'll spend 6x this in the pub afterwards anyhow) and you'll get alot of takers. We're not as backward as everyone thinks
I think if you were to contact the universities (University College Dublin, Trinity College (hold it here, city center), Dublin City University) you would get a hall for free.
If you do plan this, let me know. I'll get the word out for you as much as I am able.
Rit.