Members of the Miami Valley Catholic Singles group will meet at the annual Dayton Celtic Festival for 10 a.m. Mass followed by breakfast and festival fun. The annual Dayton Celtic Festival brings some of the best bands from Ireland and Celtic bands from around the region to the city's riverfront for three days. Music on multiple stages; entrance is free. Meet at the rear of the United Irish of Dayton Stage (Five Rivers MetroParks Pavilion) at 9:30 am. For information call…