The 2016 Summer Olympics, officially known as the Games of the XXXI Olympiad and as Rio 2016, 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). 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. The games will open on August 5, 2016 and the closing ceremony will be on August 21, 2016. There will be 35 competition venues mainly in Barra da Tijuca, but also in three other zones: Copacabana, Deodoro, and Maracanã. It will be the first time a South American and Lusophone city will host the event.