Bolder Boulder 10K
The city of Boulder, Colorado hosts a 10 Km road run, the Bolder Boulder, on Memorial Day, every year since 1979. The race involves over 50,000 runners, joggers, walkers, and wheelchair racers, making it one of the largest road races in the world. The race ends at the University of Colorado's Folsom Field with a Memorial Day Tribute, one of the largest Memorial Day gatherings in the United States.

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