Featuring gems, minerals and rock-related items, the Mariposa Gem and Mineral Club hosts its annual Mariposa Gem and Mineral Show at the Mariposa Fairgrounds on October 30 and 31, 2021. The event features a raffle, silent auction, geode cutting, food, speakers and demonstrations. Hours for Saturday, October 30 are 10 a.m. to 5 p.m., 10 a.m. to 4 p.m. Sunday. Admission is $4 for adults, kids 14 and under get in free.