Expo 2020 declined to make any official available to speak to The Associated Press prior to the opening. Chicago became the “White City” in 1893 as electric lights bathed its world’s fair site, which also boasted the first Ferris wheel. Expo 2000 in Germany drew 18 million visitors, well short of the 40 million expected. Dubai, which won the rights to host the Expo in the years after FIFA awarded Qatar the 2022 World Cup, will be the Arab world’s first. Relying on a projection of 25 million visitors, EY estimated a $6 billion boost during the event.