By Denny Dyroff, Entertainment Editor, The Times “Third Thursday” has a special meaning for music fans around the area – especially for fans of blues music. For years, Jamey’s House of Music (32 South Lansdowne Avenue, Lansdowne, 215-477-9985,www.jameyshouseofmusic.com) has had a jazz-based show every Thursday called “Jazz at Jamey’s.” The event has evolved into something more. “Starting...