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
Cape Verde at the 2000 Summer Olympics men's marathon. The Comité Olímpico Cabo-verdeano (Olympic Committee of Cape Verde) was recognized by the International Olympic Committee on 1 January 1993. Their first Summer Olympics were the 1996 Atlanta Olympics, where they sent 3 athletes, all in athletics. As of the 2018, Cape Verde has never won an Olympic medal. The 2000 Summer Olympics were held from 15 September to 1 October 2000; a total of 10,651 athletes represented 199 National Olympic Committees. Sydney was their second appearance at an Olympic Games; the island nation has never participated at a Winter Olympic Games as of the 2018 Winter Olympics.