The Ninth annual OSCC Trout Derby is 6:30 a.m. to 3 p.m. Saturday at Lafayette Reservoir, sponsored by Outdoor Sportsmen’s Coalition of California. The registration deadline is 6:30 a.m., Saturday on the grass above the reservoir store on the hill, 3849 Mt. Diablo Road. Fee includes prizes in four categories, tri-tip sandwiches for lunch. $25 ages 16 and older; $5 ages 5-15, accompanied by an adult. Contact: George, 925-372-6622, days.