&$ &$ When Beijing shopper Qian Jiatun recently visited the adidas Flagship Store in Sanlitun Village, Beijing, he found people dressed like Darth Vader and Stormtrooper striking poses for the visitors. On the same day, Huang Chuyang and his friends were screaming in the shop Source in Shanghai. They claimed Stormtroopers were invading the city. It was, actually, a Star Wars fans party with free …