Guests attend the Diner en Blanc at Nelson A. Rockefeller Park in New York City on Monday. The Diner en Blanc, the world’s only viral culinary event, is a chic secret pop-up style picnic from France and is celebrating its 25th anniversary. The outdoor site — always a landmark location — is revealed at the last-minute. Guests are asked to dress entirely in elegant white, bring a picnic basket of food, fine porcelain and silverware, white tablecloths, tables and chairs. Xinhua