"In 1979 we dreamt of attracting a few hundred of our friends to race though the streets of Boulder, Colorado to celebrate Memorial Day with our families. Fast forward almost 40 years and the BolderBOULDER has grown to become one of the largest and most highly acclaimed 10K’s in the world. Almost 1.2 million runners, joggers, walkers and spectators of all ages have gathered over the years to create a spectacle that defies description. Each year we host 50,000+ participants and 100,000+ spectators throughout the course for what we like to call the biggest and best Memorial Day celebration on earth." Visit the website to register.
"For over thirty years, the Boulder Creek Festival® has been the unofficial kickoff to summer in Boulder. Widely considered Boulder County’s favorite event, the Festival includes three days of festivities featuring a large variety of events, activities, food and entertainment unique to the Boulder community. The Festival is free to the public."
Only 1 hour and 15 minutes from Westminster, CO! Definitely worth checking out if you have time.