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 was introduced by Johann Rosenzopf from Austria in 1998. On 6 July 2007, International Olympic Committee (IOC) members at the 119th IOC session in Guatemala City approved the creation of a youth version of the Olympic Games, with the intention of sharing the costs of hosting the event between the IOC and the host city, whereas the traveling costs of athletes and coaches were to be paid by the IOC. These Games will also feature cultural exchange programs and opportunities for participants to meet Olympic athletes. Several other Olympic events for youth, like the European Youth Olympic Festival held every