Brussels - The Color Run

"The Color Run, also known as the Happiest 5K on the Planet, is a 5k run where thousands of runners – all starting in a white T-shirt – get covered in colored powder from head to toe throughout the race. Once the runners finish, the fun continues at the "Color Festival", where more color powder is thrown in the air, making every runner look like a walking rainbow."
 http://www.brusselslife.be/en/article/the-color-run-tour-taxis