Chicago seems to be the hot ticket right now! Earlier this week it was announced that a flagship Topshop store will be opened in the area and today we're informed that Calvin Klein will open his first pop up shop in the great Windy City. Today, 30th September 2010, Calvin Klein will be hosting a VIP shopping evening to launch the store which will carry the Calvin Klein sportswear collection. It will stay "popped up" until the 8th of October. And, of course, there's a charitable element involved. A portion of all sales from the shop will go to The Lynn Sage Cancer Research Foundation in aid of National Breast Cancer Awareness Month.