On Saturday, August 8, 2026, from 9:00am-4:00pm, the Siouxland Gem and Mineral Society is holding its 2nd Annual Rock Swap at the Lewis and Clark Interpretive Center. This is a FREE event for vendors and the public.

The event will feature the buying, selling and trading of rocks and minerals, rock painting, and lapidary demonstrations. Jewelry will also be for sale.

Vendors, please register to reserve a table by calling 712-253-5479. Bring your own table or trunk, if you are able. In case of rain, the event will be moved inside of the center.