Over 5,000 Visitors Expected to Attend Blackwater Valley Opera Festival - Are You Ready for the Magic? Just under a week until the enchanting sound of opera fills the summer air at Blackwater Valley Opera Festival. Over 5,000 visitors are expected to engage their senses at the 8-day festival which runs from 27 May to 3 June at Lismore,Cappoquin, Dungarvan, Stradbally, Youghal, and Castlemartyr. With world-class performances, bespoke dining experiences, and stunning historic venues opening their doors