The 8th Annual ShamROCK Stampede is a lively St. Patrick's Day-themed running event on Saturday, March 14, 2026, at the Douglas County Events Center in Castle Rock, CO, featuring an RRCA Colorado State Championship 10K, a flagship 5K, a free Kid’s 1K Sham-Scram fun run/walk, and an indoor health expo—all supporting veterans, first responders, and mental wellness causes through RUN to Change Lives.