howdy,
there seems to be a fair few organised in Cork and Galway – check out Boards.ie for details or Room101/org. There’s a big LAN event in Galway weekend after next
Skyclad could probably tell you more, he used to organise these events himself
Also we (IGDA that is) are working with the Digital Hub to bring the World Cyber games to Ireland this Autumn. More news as it becomes available