Derby Day Soirée3-9 p.m. Saturday, May 3, Wibby Brewing, 2400 Sherman St., Longmont. FreeHead to Roots Music Project for this monthly open mic for sober creatives featuring live music, storytelling, poetry and more. EFAA Friend Fest3-6 p.m. Sunday, May 4, The Rayback Collective, 2775 Valmont Road, Boulder. Spring Art Market9 a.m. to 2 p.m. Saturday, May 3, Boulder Museum of Contemporary Art, 1750 13th St., Boulder. Flagstaff Nature Center, Flagstaff Summit Road, Boulder.