Donner Party Picnic BBQ, music, buddies, and bikes…ride out to the Sierra Nevada Mountains and make unforgettable memories with friends. July 25 – 27, 2025 | Rollins Lake Grass Valley, CA Summer Motorcycle Campout in the Sierra Nevada range The perfect adventure for chopper enthusiasts. We’ll have karaoke, choppers, tasty food, gorgeous rides, and a community of bikers like you.