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?

full_context: Document 1: Bernadette Coston: 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.
Document 2: 2020 Summer Olympics: The 2020 Summer Olympics, officially known as the Games of the XXXII Olympiad and commonly known as Tokyo 2020, is a major international multi-sport event due to be celebrated in the tradition of the Olympic Games as governed by the International Olympic Committee (IOC).
Document 3: List of 2012 Summer Olympics medal winners: The 2012 Summer Olympics, officially known as the Games of the XXX Olympiad, were held in London, United Kingdom, from 25 July 2012 to 12 August 2012.
Document 4: Mariaan de Swardt: Mariaan de Swardt (born 18 March 1971) is a former tennis player from South Africa, who played as a professional from 1988 to 2001. She twice represented her native country at the Summer Olympics, in 1992 and 1996, and was a member of the South African Fed Cup Team in 1992 and 1994–1997. In 2006, de Swardt became a U.S. citizen.
Document 5: Kate Woods (field hockey): Kate Woods (born 11 October 1981) 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.
Document 6: Wendy Botha: Wendy Botha (born 22 August 1965) is a four-time world surfing champion. She won her first title as a South African citizen in 1987, then she became an Australian citizen and won three more titles in 1989, 1991, and 1992. She also posed nude for Australian Playboy for the September issue of 1992.
Document 7: Nicolene Terblanche: Nicolene Terblanche (born 22 February 1988, Groblersdal, Sekhukhune) 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.
Document 8: Dirkie Chamberlain: Dirkie Chamberlain (born 3 November 1986, Pretoria) 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. She has also competed at the 2010 and 2014 Commonwealth Games.
Document 9: Great Britain at the 2012 Summer Olympics: Great Britain, represented by the British Olympic Association (BOA), competed at the 2012 Summer Olympics in London, United Kingdom, from 27 July to 12 August 2012 as the host nation. British athletes have competed at every Summer Olympic Games in the modern era, alongside Australia, France and Greece, though Great Britain is the only one to have won at least one gold medal at all of them. London is the only city to host the Summer Olympics on three different occasions, having previously done so in 1908 and 1948. Soon, it will be joined by Paris in 2024 and Los Angeles in 2028 in hosting the Olympic Games for a third time. Team GB, organised by BOA, sent a total of 541 athletes, 279 men and 262 women, to the Games, and won automatic qualification places in all 26 sports.
Document 10: 2008 Summer Olympics: The 2008 Summer Olympic Games, officially known as the Games of the XXIX Olympiad () and commonly known as Beijing 2008, was a major international multi-sport event that took place in Beijing, China, from 7 to 24 August 2008. A total of 10,942 athletes from 204 National Olympic Committees (NOCs) competed in 28 sports and 302 events (a total of one event more than the schedule of the 2004 Games). China became the 22nd nation to host the Olympic Games and the 18th to hold a Summer Olympic Games. It was the third time that the Summer Olympic Games were held in East Asia and Asia, after Tokyo, Japan, in 1964 and Seoul, South Korea, in 1988.
Document 11: 2012 Summer Paralympics: The 2012 Summer Paralympics, the 14th Summer Paralympic Games, and also more generally known as the London 2012 Paralympic Games, were a major international multi-sport event for athletes with disabilities governed by the International Paralympic Committee (IPC), that took place in London, United Kingdom from 29 August to 9 September 2012. These Paralympics were one of the largest multi-sport events ever held in the United Kingdom after the 2012 Summer Olympics, and were the largest Paralympics ever: 4,302 athletes from 164 National Paralympic Committees participated, with fourteen countries appearing in the Paralympics for the first time ever. A total of 503 events in 20 sports were held during these games; for the first time since their suspension after the 2000 Paralympics, events for the intellectually disabled were also held in selected sports.
Document 12: Illse Davids: Illse Davids (born 26 March 1987, Cape Town) 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. She studied at the University of North Carolina and played for their hockey team.
Document 13: 2012 Summer Olympics: 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.
Document 14: Sulette Damons: Sulette Damons (born 30 October 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.
Document 15: 2012 Summer Olympics opening ceremony: The opening ceremony of the 2012 Summer Olympic Games took place on the evening of Friday 27 July in the Olympic Stadium, London. As mandated by the Olympic Charter, the proceedings combined the formal ceremonial opening of this international sporting event (including welcoming speeches, hoisting of the flags and the parade of athletes) with an artistic spectacle to showcase the host nation's culture. The 2012 Games were formally opened by Queen Elizabeth II. The spectacle was entitled Isles of Wonder and directed by Academy Award-winning British film director Danny Boyle.
ground_truth: 2012 Summer Olympics