December 16th, Amsterdam. During this 5K run, people have the chance to show pride in their ugly sweater as their sweat it out at the national Ugly Sweater Run at the Vondelpark, in Amsterdam. The event allows those who take part the chance to run, walk or jingle into the holiday spirit with friends, family, kids and dogs. Ugly sweater run is also celebrated in other countries, like in the USA, making of this, a Christmas tradition. A portion of the proceeds was donated to Save the Children charity. This edition was a great success, with around 1800 people running with their "ugliest" sweater.