Bluegrass Festival – Happening Through Sunday June 16, 2017 | wendy Love all the photos and check-ins coming from the CBA’s Father’s Day Bluegrass Festival 2017 at the Fairgrounds. The festival is happening through Sunday. Tickets can be purchased at the gate or at fathersdayfestival.com. Photo by George Martin. Categories: Events and Nevada County Fairgrounds.Tags: bluegrass, bluegrass music festival, California, Fairgrounds, Grass Valley, local events, music, and music festival.