Summer Olympic Games demand for tickets to all levels of each event, there was controversy when seats set aside for sponsors and National Delegations went unused in the early days. A system of reallocation was put in place so the empty seats were filled throughout the Games. Rio de Janeiro, Brazil hosted the 2016 Summer Olympics, becoming the third city in the Southern Hemisphere to host the Olympic Games after Melbourne, Australia, in 1956 and Sydney, Australia, in 2000, and the first South American city to host the Olympics. The preparation for these Games was overshadowed by controversies, including the instability of Brazil's
2016 Summer Olympics Session in Copenhagen, Denmark, on 2 October 2009. Rio became the first South American city ever to host the Olympic Games. These were the first games to be held in a Portuguese-speaking country, the first summer edition to be held entirely in the host country's winter season, the first since 1968 to be held in Latin America, and the first since 2000 to be held in the Southern Hemisphere. The lead-up to these Games was marked by controversies, including the instability of Brazil's federal government; the country's economic crisis; health and safety concerns surrounding the Zika virus and significant pollution