The 2016 Summer Olympics, officially known as the Games of the XXXI Olympiad, 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. The host city of the Games will be Rio de Janeiro, Brazil, announced at the 121st IOC Session held in Copenhagen, Denmark, on October 2, 2009. They are scheduled to be held from August 5 to 21, 2016, making these the second Summer Olympics to be held during the host city's winter. There will be 35 competition venues mainly in Barra da Tijuca, but also in three other zones: Copacabana, Deodoro, and Maracanã. It will mark the first time a South American city hosts the event, the third to host in the Southern Hemisphere, and also the first time a Portuguese speaking country hosts the event. These will be the first Summer Olympic Games since the Sydney 2000 Olympics not to be held in the host nation's capital city.