Sebastian Coe (C), chairman of LOCOG presses the button with nine-year-old Niamh Clarke-Willis (L) to officially open the Olympic Stadium during day two of the BUCS VISA Athletics Championships 2012 LOCOG Test Event for London 2012 at the Olympic Stadium on May 5, 2012 in London. Around 40,000 members of the public witnessed the opening and a laser light show. [Xinhua/Wang Lili]