Apollo's Fire, Cleveland's own, internationally acclaimed baroque orchestra, performs an Appalachian Christmas program tonight, with a concert dubbed Christmas on Sugarloaf Mountain: An Irish-Appalachian Celebration. There will be fiddlers, singers and bagpipe players, all under the guidance of artistic director Jeannette Sorrell. Tonight's performance begins at 8 at the Cleveland Museum of Art. Tickets start at $28. (Niesel)