New York (AFP) - Some 5,000 foodies and fashionistas gathered late Tuesday on the banks of the Hudson River in New York for the fifth edition of the "Diner en blanc" (Dinner in White).Organizers of the pop-up picnic where attendees dress to the nines entirely in white chose the huge Pier 26 structure this time in the hip Tribeca neighborhood.In accordance with tradition, organizers kept the location secret until the last minute.Participants, all signed up ahead of time, brought their own food, along with tables, chairs, dishes, a white tablecloth, roses and hydrangeas -- all white, of course.The uber-trendy picnic had a waiting list of 35,000 people who never made it to the event.Under an open sky in blistering heat of 91 degrees Fahrenheit (33 Celsius), the crowd by kicked off the evening twirling their white napkins.In retro style, men and women dressed with extravagant hats, mantillas, feathers and lace dresses.All is in accordance with the organizers' dictum.Guests "must wear white and be dressed elegantly.