RAPID CITY, SD (KOTA TV) - Mike Chamberlain and Kendra Rupert from the West Dakota Gem and Mineral Society are in to talk about the group’s upcoming rock show. The 37th annual event will take place on July 22 from 9a.m. to 6p.m. and 10a.m. to 4p.m. on July 23 at the Rushmore Plaza Civic Center.