May 30, 2015 @ 1:00 pm - 10:00 pm Lost Highway Festival 2015 San Manuel Amphitheater 2575 Glen Helen Pkwy, San Bernadina Ticketed - The inaugural Lost Highway Festival will bring bikers and music lovers together this May in San Bernadino, Calif. The two-day festival is set for May 29-30 at San Manuel Amphitheater and Glen Helen Regional Park with a lineup of rock and country acts.