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
Youth Olympic Games other year with summer and winter versions, and the Australian Youth Olympic Festival, have proven successful. The Youth Games are modelled after these sporting events. The YOG are also a successor to the discontinued World Youth Games. The Summer Youth Olympic Games of Singapore in 2010 and Nanjing in 2014 each played host to 3600 athletes and lasted 13 days, whereas the Winter YOG of Innsbruck in 2012 had 1059 athletes and Lillehammer in 2016 had 1100 athletes and lasted 10 days. Even though this exceeded initial estimates, the YOG are still both smaller in size as well as shorter