Warren County’s premiere of Bluegrass Underground by Nashville Public Television will be Thursday, Jan. 19 at 6 p.m. The event will be held at Warren County High School’s auditorium.“This is free to the public,” said city administrator David Rutherford. “It’s one night only.”What residents will be viewing is the premiere of season one of Bluegrass Underground done by Nashville Public Television. Segments of the season’s episodes were clipped and combined into a show.