High Quality Content by WIKIPEDIA articles! The 1967 International and Universal Exposition or Expo 67, as it was commonly known, was the general exhibition, Category One World`s Fair held in Montreal, Quebec, Canada, from April 27 to October 29, 1967. It is considered to be the most successful World`s Fair of the 20th century, with the most attendees (50 million visits) to that date and 62 nations participating. It also set the single-day attendance record for a world`s fair, with 569,000 visitors on its third day.