Hurling and Gaelic football games are held from February to November at Europe's fourth-largest stadium (capacity around 82,000), north of the Royal Canal in Drumcondra; see www.gaa.ie for schedules.
The stadium is also the administrative HQ of the Gaelic Athletic Association (GAA), the body that governs them. To get an idea of just how important the GAA is here, a visit to the museum is a must, though it will help if you're a sporting enthusiast. The twice-daily tours (except match days) of the impressive stadium are excellent.