This St. Patrick’s Day, while hundreds of Bostonians are sharing in a pint, others will take to the streets in the Ras na hEireann U.S.A. 5 km road race. Known as the most genuine Irish race this side of the Atlantic, the Ras na hEireann is named after the original cross country road race that has been held in Ireland for decades. All runners are welcome to dress in their finest Irish apparel for this festive and good-spirited event.