SLO EarthFest is a free, family-friendly celebration of sustainability happening Saturday, April 18, 2026, from 11 a.m. to 5 p.m. at Santa Rosa Park in San Luis Obispo. This event brings the community together to learn about climate action, explore practical solutions, and enjoy live music, a kids zone, a sustainable makers market, wellness activities, and more. SLO Climate Coalition hosts this event with the goal of inspiring connection, education, and a greener future for the region.