Bids for the 2018 Summer Youth Olympics IOC Executive Board selected three candidate cities. On August 30, 2011 Buenos Aires and the Argentine Olympic Committee announced that they will bid for the 2018 Summer Youth Olympic Games. Buenos Aires bid to host the 1956 and 2004 Summer Olympics but lost to Melbourne and Athens respectively. On September 19, 2011, it was announced that Glasgow would submit to the British Olympic Association (BOA) a proposal to bid for the 2018 Summer Youth Olympics. Glasgow hosted the 2014 Commonwealth Games. The city has never made an Olympic bid before. On February 22, 2012 the BOA agreed to put Glasgow
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