(ABC, 1969-1971). After the great success of his two live prison albums, “At Folsom Prison” and “At San Quentin,” the ABC television network approached country music icon Johnny Cash to host his own musical variety show. Starts at 7:30 p.m. Free, at the Library of Congress Packard Campus Theatre located at 19053 Mt. Pony Road in Culpeper. No reservations required. For info, call 202-707-9994.