By Denny Dyroff, Entertainment Editor, The Times Gretchen Emery Band This is a good weekend for blues fans with shows by the Gretchen Emery Band, the Wendy Logan Band and the Deb Callahan Band. The Gretchen Emery Band continues to add to its fan base by performing well-received shows at popular area venues such as Jamey’s House of Music, the Elkton Music Hall and Stoney’s Pub. On December...