Types
Presently, there are two types of world expositions: registered and recognized (sometimes unofficially known as "major" and "minor" fairs, respectively). Registered exhibitions are the biggest category events. Previously, registered expositions were called "Universal Expositions". Even though this name lingers on in public memory, it is no longer in use as an official term. At registered exhibitions, participants generally build their own pavilions. They are therefore the most extravagant and most expensive expos. Their duration may be between six weeks and six months. Since 1995, the interval between two registered expositions has been at least five years. Most recently, the registered exposition Expo 2010 in Shanghai was held from May 1 through November 1, 2010.
Recognized expositions are smaller in scope and investments and generally shorter in duration; between three weeks and three months. Previously, these expositions were called "International or Specialized Expositions" but these terms are no longer used officially. Their total surface area must not exceed 25 ha and organizers must build pavilions for the participating states, free of rent, charges, taxes and expenses. The largest country pavilions may not exceed 1,000 m2. Only one recognized exhibition can be held between two registered exhibitions.
There are also two types of auxiliary expositions: the horticultural exhibitions, which are joint BIE and AIPH-sanctioned 'garden' fair in which participants present gardens and garden pavilions; and the Milan Triennial Exhibition of Decorative Arts and Modern Architecture.
Read more about this topic: World's Fair
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