There is no current centralised means of finding out that I know of. I don’t hear about many of the events that go on there myself and I am just across the road from the place.
I found out about this one in an email this morning from Mark O’Tool ( the games ireland guy ). I think it is him putting this one on. But my understanding is that there are loads of events put on my different folk, hence the lack of centralised and organised announcements.