Short answers, pulled from the story.
Prague organized the first World's Fair in Bohemia in 1791 during the coronation of Leopold II as king of Bohemia. The event was held inside the Clementinum building to celebrate manufacturing methods in the region.
The Great Exhibition opened in London in 1851 within the Crystal Palace in Hyde Park. Prince Albert, husband of Queen Victoria, conceived this idea which set a precedent for future gatherings focused on trade and technology.
The Paris-based Bureau International des Expositions (BIE) has served as an international sanctioning body since 1928. The adoption of the Convention Relating to International Exhibitions established this authority over four types of international exhibitions.
World Expo duration may be between six weeks and six months with at least five years between two events since 1995. World Expo 2015 took place in Milan from May 1 to October 31.
Expo 67 in Montreal retired the term world's fair in favor of Expo because new terminology had been popular in French language since the Brussels World Fair in 1958. These fairs encouraged effective intercultural communication alongside sharing technological innovation.