The Third Annual Color Run in Los Angeles. June 21, 2014. The unique event, known as “The Happiest 5K on the Planet,” brings together thousands of jubilant runners (or walkers!) for a celebration of healthiness, happiness, and individuality. The Color Run is aptly named for the vibrant colors of paint that are sprayed on the gleeful participants as they hit milestones throughout the course. The result? A very colorful crowd of fun-loving people of all ages, sizes, and colors.