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The Merrell Down & Dirty National Mud Run Series presented by Subaru arrives in Denver this Sunday, June 24! This exhilarating racing series features 5K and 10K off-road courses filled with military-style obstacles, commanding cargo climbs, water crossings, and, you guessed it, tons of mud! But don’t worry; it’s all in good clean fun to support a worthy cause – Operation Gratitude -- a charity that sends personalized care packages to deployed military personnel.