There are many different events in Ireland this year.
For example, there are many food-related festivals, like the Wine Festival and the Waterford Festival of Food. The oyster season can be enjoyed in Galway, and farmer's markets can be easily found in Ireland during these events.

There're other events such St. Patricks Day, in March, and the Street Performance World Championships, in June (Dublin and Cork).
If you're more of a sport person, there are many activities in the Wicklow Outdoors Festival, including rock climbing archery, windsurfing and horseriding.