The Marcus Whitman Gem and Mineral Society show will take place Saturday and Sunday at the Walla Walla County Fairgrounds Community Building, 10 a.m.-5 p.m. Admission for adults is $3, free for children 12 and younger.

The Gem and Mineral Society is celebrating its 50th anniversary show.

Visitors can learn about geology, minerals and examine a full-size T-Rex skull.

James Payne, a flint knapper, will make arrowheads. 

The show started years ago in the schools and has been at Eastgate Mall, Blue Mountain Mall and now the Fairgrounds.