Exposition universelle de Paris de 1900 :
This is the biggest exposition in France, it attracted 50.8 million visiteurs.Des International Competition and Sports Physical exercises are organized during the exhibition. Baron de Coubertin tried, unsuccessfully, to be admitted as the Olympics. However, since 1920 the Olympic movement claims as these Olympics Contest organized, funded and rewarded refereed by one of the Exhibition Committee. View Summer Olympics 1900 where the only time reference to justify ranking is nothing other than one of the official reports of the Exhibition. 
Serais t-il possible un évènement plus récent ?