The Cork Folk Festival which opened last night runs until the early hours of Monday morning. The highpoint will be a concert tomorrow night featuring musicians influenced by Sean O Riada. Among these will be the accordionist Mairtin O'Connor, the guitarist and bazouki player Garry O'Briain, the singer Aine Ui Cheallaigh, the uilleann piper Peter Browne and the flute player Niall Keegan.