The Fathers Day Bluegrass Festival takes place June 18-21, 2026 in Grass Valley, California, featuring an impressive lineup of 16 bluegrass and acoustic artists. Headliners include The Bluegrass Cardinals, Sam Grisman Project, and The Po' Ramblin' Boys, alongside notable performers like Bronwyn Keith-Hynes, Missy Raines & Allegheny, and Bruce Molsky & Darol Anger. The festival showcases a diverse range of acoustic music styles including traditional bluegrass, rock, acoustic blues, dawg music, and jam bands. This four-day celebration of American roots music brings together both established and emerging artists from across the United States for an authentic bluegrass festival experience.