Chart-topping Irish band to perform in Wexford medieval castle for free A chart-topping Irish band are set to perform at an annual festival in Wexford this summer. The Festival of Ferns is a two-day community celebration held in Ferns, County Wexford, Ireland, focusing on the town’s rich history as the ancient capital of Leinster, which will take place on Saturday, May 30 and Sunday, 31.