Question: What was this major international multi-sport event, with the opening ceremonies taking place on 27 July, and in which the South African field hockey player Bernadette Coston competed for the outh Africa women's national field hockey team?
Related documents: [0]  [DOC] The 2012 Summer Olympics, formally the Games of the XXX Olympiad and commonly known as London 2012, was a major international multi-sport event celebrated in the tradition of the Olympic Games, as governed by the International Olympic Committee (IOC). It took place in London and to a lesser extent across the United Kingdom from 25 July to 12 August 2012. The first event, the group stage in women's football began on 25 July at the Millennium Stadium in Cardiff, followed by the opening ceremonies on 27 July. 10,768 athletes from 204 National Olympic Committees (NOCs) participated. [END] 
[1]  [DOC] Bernadette Coston (born 17 August 1989) is a South African field hockey player. At the 2012 Summer Olympics she competed with the South Africa women's national field hockey team in the women's tournament. [END] 
Answer: 
2012 Summer Olympics
2012 Summer Olympics