A total of 435 people have registered on Facebook to attend the Sneakerness convention in Cologne on May 21-22, which is open to trade visitors and the general public. It was going to be held for only one day on Saturday, but the organizers have decided to extend it for an extra day. Exhibitors will include brands such as Adidas, Keds, Lacoste, Nike and Puma. The themes of the convention include the history of skate shoes, illustrations of vintage sneakers, environmental sneakers and the future of sneakers. The event will be enlivened with street art, concerts and shoe customizing sessions for youngsters and kids. Similar Sneakerness conventions are scheduled for June 18 in Zurich, Aug. 27 in Amsterdam and Sept. 10 in Vienna.