- Location: Riverwood Park, 121 Cerney Circle, Bismarck, ND 58504 - Date: Sunday, April 20, 2026 (Earth Day weekend) - Time: 11:00 AM - 4:00 PM - Cost: Free - Source: [visitbismarck.com/events/earth-day-festival]() (features live music, eco-vendors, kids' activities, and sustainability workshops).