While Chicago is buzzing about the G8 and NATO summits that will lock down much of the South Loop from May 1–21, Columbia plans on staying open.The G8 and NATO summits, taking place at McCormick Place, 2301 S. Lake Shore Drive, are expected to attract more than 7,000 delegates and staff, as well as 2,500 journalists from across the globe, according to Jennifer Martinez, press secretary for the Chicago G8 and NATO Host C...