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
Colonialism and the Olympic Games of the Tibetan riots. The media reported that the attitudes of Han Chinese citizens towards non-Chinese and Chinese minorities in China noticeably worsened. In late April, Chinese Internet censors, who had previously permitted posts critical of non-Chinese, began blocking words such as "Carrefour", in what was seen as an attempt to calm tensions before the games. Again building on lessons learned from previous Olympic Games held in Canada, the 2010 Winter Games saw an unprecedented level of involvement by and collaboration with indigenous people, namely in the form of the Four Host First Nations (FHFN). Composed of representatives from the