Expo 67 (Montréal, Québec)

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.

Expo '67 is considered to be the most successful World's Fair of the 20th century, with the highest attendance of any fair up to that time. Participating in the fair were 62 different nations. The admission ticket was referred to as a passport with daily admission a passport card, weekly admission a passport folder and admission for the season (April through October) a special passport folder with room for the participants photograph.

Source: http://en.wikipedia.org/wiki/Expo_67 EXPO '67 Information Manual