On Saturday, March 29th from 6:30p.m., to 9:30p.m., the City of Chicago, WWF, and Sony Pictures will host a celebration in recognition of Earth Hour. Chicagoans are invited to join the festivities, which will be held at the Chicago Cultural Center’s famed Preston Bradley Hall. Guests will have the opportunity to meet and have their picture taken with Spider-Man and join in activities like face painting and prize drawings. The first 400 guests will reach receive an exclusive glow-in-the-dark t-shirt from the film.