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 YOG, and four of them include bringing together the world's best young athletes, offering an introduction into Olympism, innovating in educating and debating Olympic values. The city of Singapore was announced as the host of the inaugural Summer Youth Olympics on 21 February 2008. On 12 December 2008 the IOC announced that Innsbruck, host of the 1964 and 1976 Winter Olympics, would be the host of the inaugural Winter Youth Olympics in 2012. The scale of the Youth Olympic Games is smaller than that of the Olympics, which is intentional and allows for smaller cities to host an Olympic event.