While in Ireland you'll see magnificent castles and dramatic landscapes, but the most magical experience of all is joining the Irish people, sharing the craic and experiencing the magic of Ireland. A terrific way to do this, besides visiting a pub (which you should definitely do at least a couple times), is to visit a festival or other gathering.
A terrific resource to find “What's On” is Georgina Campbell's Ireland Guide. You can search “What's On” around Ireland or by county. It's a brilliant resource to help you make the most of your Ireland vacation!
Photo credit: Irish Tourism website. Click the link to learn more about the Fleadh Cheoil na hEireann (Festival of Music in Ireland).