Diner en Blanc Washington, D.C., is more than a mysterious, elaborate picnic. Imagine an outdoor dinner party at a secret location and one very specific dress code: all white. Welcome to Diner en Blanc.

For 11 years, thousands of Washingtonians have dressed head-to-toe in white, packed gourmet meals and folding tables, and followed strangers to a secret location for one of the city’s most unusual summer traditions.