Saturday, December 16, 2017
Here's a description of it from the National Zoo's website:
Join the thousands of visitors who make ZooLights a part of their annual holiday tradition. A free event, ZooLights includes live music performances, tasty winter treats and plenty of opportunities for holiday shopping. More than 500,000 environmentally-friendly LED lights transform the Zoo into a winter wonderland complete with a dazzling light show set to music!