Every year, the National Zoo invites thousands of visitors after hours for ZooLights. The event includes live music, winter treats and opportunities for holiday shopping. Oh — and more than 500,000 LED lights decorate the zoo, transforming it into a winter wonderland. There are additional rides and attractions, including the National Zoo Choo-Choo, Snow-less Tubing and Carousel. The ZooLights are open from November 23 to January 1 (except December 24, 25 and 31) from 5:00pm to 9:00pm. The event is free.