Worldcon, or more formally the World Science Fiction Convention, the annual convention of the World Science Fiction Society (WSFS), is a science fiction convention. It has been held each year since 1939. The members of each Worldcon are the members of WSFS, and vote both to select the site of the Worldcon two years later, and to select the winners of the annual Hugo Awards, which are presented at each convention.
NASFiC, an abbreviation for North American Science Fiction Convention, is a science fiction convention scheduled in North America during years when a Worldcon is being held outside North America; NASFiCs are held only during such years. Bids for the location of a NASFiC are voted on by the membership of the Worldcon, the year after a non-North-American Worldcon site has been selected. As of 2014, this is one year in advance of a potential NASFiC, since Worldcon sites are chosen two years in advance.
The 63rd World Science Fiction Convention (Worldcon), also known as Interaction, was held on 4–8 August 2005 at the SEC Centre with the attached SEC Armadillo and Moat House Hotel in Glasgow, United Kingdom. Parties took place at the Hilton Hotel.
The 48th World Science Fiction Convention (Worldcon), also known as ConFiction, was held 23–27 August 1990 at the Netherlands Congress Centre in The Hague, Netherlands.
The 65th World Science Fiction Convention (Worldcon), also known as Nippon 2007, was held on 30 August–3 September 2007 at the Pacifico Yokohama Convention Center and adjoining hotels in Yokohama, Japan.
The 10th World Science Fiction Convention, or the tenth instance of Worldcon, was held on the Labor Day weekend, 30 August – 1 September 1952, at the Morrison Hotel in Chicago, and was chaired by Julian May.
The 66th World Science Fiction Convention (Worldcon), also known as Denvention 3, was held on 6–10 August 2008 at the Colorado Convention Center and the Sheraton Denver Downtown Hotel in Denver, Colorado, United States.
The 37th World Science Fiction Convention (Worldcon), also known as Seacon '79, was held on 23–26 August 1979 at the Metropole Hotel in Brighton, United Kingdom.
The 18th World Science Fiction Convention (Worldcon), also known as Pittcon, was held on 3–5 September 1960 at the Penn-Sheraton Hotel in Pittsburgh, Pennsylvania, United States.
The 23rd World Science Fiction Convention (Worldcon), also known as Loncon II, was held on 27–30 August 1965 at the Mount Royal Hotel in London, United Kingdom. It was the second Worldcon to be held in London, following the original Loncon in 1957.
The 24th World Science Fiction Convention (Worldcon), also known as Tricon, was held on 1–5 September 1966 at the Sheraton-Cleveland in Cleveland, Ohio, United States. Officially, the convention was hosted by three cities in the region: Cincinnati, Ohio, Cleveland, Ohio, and Detroit, Michigan; hence the name "Tricon".
The 25th World Science Fiction Convention (Worldcon), also known as NyCon 3 or Nycon 3, was held on 31 August–4 September 1967 at the Statler Hilton Hotel in New York City, United States.
The 27th World Science Fiction Convention (Worldcon), also known as St. Louiscon, was held on 28 August–1 September 1969 at the Chase Park Plaza Hotel in St. Louis, Missouri, United States.
The 28th World Science Fiction Convention (Worldcon), also known as Heicon '70, was held on 20–24 August 1970 at the Stadthalle Heidelberg in Heidelberg, West Germany.
The 36th World Science Fiction Convention (Worldcon), also known as IguanaCon II, was held on 30 August–4 September 1978 at the Hyatt Regency Phoenix, Adams House, Phoenix Convention Center, and Phoenix Symphony Hall in Phoenix, Arizona, United States. Despite the name, this was the first "IguanaCon".
The Hugo Award is an annual literary award for the best science fiction or fantasy works and achievements of the previous year, given at the World Science Fiction Convention (Worldcon) and chosen by its members. The Hugo is widely considered the premier award in science fiction. The award is administered by the World Science Fiction Society. It is named after Hugo Gernsback, the founder of the pioneering science fiction magazine Amazing Stories. Hugos were first given in 1953, at the 11th World Science Fiction Convention, and have been awarded every year since 1955.
The 75th World Science Fiction Convention (Worldcon), also known as Worldcon 75, was held on 9–13 August 2017 at the Helsinki Exhibition and Convention Centre in Helsinki, Finland.
The 77th World Science Fiction Convention (Worldcon), also known as Dublin 2019—An Irish Worldcon, was held on 15–19 August 2019 at the Convention Centre, as well as in The Point Square, Dublin, Ireland.
The 80th World Science Fiction Convention (Worldcon), also known as Chicon 8, was held on 1–5 September 2022 in Chicago, Illinois, United States.