Onesie Conventions
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There have been a lot of one-off conventions: Some intentionally so; others not so much. We collect them here.
We do not include conventions which are part of a series such as Worldcon, Eastercon, Eurocon, etc., regardless of whether they have similar names or not. Nor do we include conventions which were intended as one-shots but later came to be seen as an instance of a continuing convention. (E.g., Smofcon 0 or Midwestcon 0.)
See also Early Conventions for a list of conventions (mostly one-shots) held before the end of 1946.
| Convention | Date | Location |
|---|---|---|
| Hydracon | Hydracon | NY, NY |
| NECON | October 14, 1951 | Bradford, UK |
| Buffalocon | May 2-4, 1952 | Buffalo, NY |
| Wiscon | September 20, 1953 | Fond Du Lac, WI? |
| X-Con | April 10, 1954 | San Francisco |
| Canberra Science Fiction Conference | March 30-April 1, 1956 | Canberra, Australia |
| Eastercon-DAG | April 1, 1956 | Fond du Lac, WI |
| IllWisCon | July 4-6, 1958 | Chicago |
| Fanarcon | December 26-28, 1958 | NY, NY |
| London Symposium | October 3, 1959 | London, UK |
| Consolacon | September 1-4, 1961 | New Orleans |
| KingCon | 1967 | Kingston, ON |
| London Minicon | November 1968 | London, UK |
| Conference on the Bibliography of Science Fiction | March 1, 1969 | NY, NY |
| 1969 Conference on Middle Earth | April 25-26, 1969 | Urbana, IL |
| A2 Relax Icon | February 1972 | Ann Arbor, MI |
| BYO-Con | 26-28 December 1972 | Melbourne, Australia |
| Cal Tech Conference | March 8-9, 1974 | Pasadena, CA |
| KWEST*Con | November 1-3, 1974 | Kalamazoo, MI |
| Infinity 74 | November 29-December 1, 1974 | NY, NY |
| Hopcon | March 7-9, 1975 | Baltimore, MD |
| Columbicon | August 8-10, 1975 | Columbia, MD |
| Blackpool Fan Con | February 6-8, 1976 | Blackpool, UK |
| Lexicon | June 18-20, 1976 | Lexington Park, MD |
| Intercon | August 13-14, 1976 | Salt Lake City, UT |
| Des Moines Con | August 28-31, 1976 | Des Moines, IA |
| Fourth Dimension Con | October 1-3, 1976 | Tallmadge, OH |
| Alpha Draconis | October 29-31 1976 | Toronto, ON |
| Luunicon | 1977 | London, UK |
| Clayton Con | March 12-13, 1977 | Lawndale, CA |
| Harcon | April 1-3, 1977 | Harriman, TN |
| Yuccacon | April 15-17, 1977 | Colorado State U. |
| Eraticon | May 28-30, 1977 | Houston, TX |
| Hippotocon | August 12-14, 1977 | Homewood, IL |
| Great Combined Milford and Clarion Decennial Jubilee, Colloquim and Beer Bash | August 26-27, 1977 | East Lansing, MI |
| Freddiecon | August 30-31, 1977 | Fredericksburg, VA |
| HBHS Minicon | December 10, 1977 | Huntington Beach, CA |
| Empirecon 1 | July 14-16, 1978 | NY, NY |
| Hark!Con | July 22, 1978 | Richmond, VA |
| LICon | August 11-13, 1978 | Plainview, Long Island |
| Un-Con | September 9, 1978 | Winnipeg, MB |
| UnreelCon | October 27-29, 1978 | Toronto |
| Kampuscon | January 20, 1979 | Lawrence, KS |
| FortCon | February 9-11, 1979 | Ft. Collins, CO |
| Whatacon | February 24, 1979 | San Diego, CA |
| Just Imagicon | 24-27 May 1979 | Memphis, TN |
| Filkon I | July 27-29, 1979 | Chicago, IL |
| KulaCon | November 30-December 2, 1979 | Vancouver, BC |
| Fantasy Worlds Midwinter Festival | February 16-17, 1980 | Berkeley, CA |
| Hoosier Con | February 29 - March 2, 1980 | South Bend, IN |
| Leapcon | February 29-30, 1980 | Arlington, VA |
| Lasfapacon | July 1-2, 1980 | LA, CA |
| Imaginitzacon | September 26-28, 1980 | Memphis, TN |
| A Mid-Winter Convention | January 23-25, 1981 | Long Beach, CA |
| Datclone | February 27-March 1, 1981 | Gettysburg, PA |
| Cinecon | April 17-21, 1981 | Melbourne, Australia |
| Filkcon West | June 5-7, 1981 | Los Angeles, CA |
| Tolkon | August 21-24, 1981 | Sydney, Australia |
| Triciticon '81 | September 18-20, 1981 | Vestal, NY |
| ConNiption | October 9-11, 1981 | White Plains, NY |
| [[ZerCon | November, 1981 | Huntsville, AL |
| Augacon | November 27-29, 1981 | San Mateo, CA |
| CONgestion | 19-21 March, 1982 | Oklahoma City, OK |
| LEXICON | 28-31 May 1982 | Leicester, UK |
| Fencon | October 16, 1982 | Cambridge, UK |
| Constellation Con | February 18-21, 1983 | Vancouver, BC |
| Colorado Mountain Con | May 6-8, 1983 | Leadville, CO |
| Valcon | June 10-12, 1983 | Valpariso, IN |
| InVention | September 23-25, 1983 | Glasgow, Scotland |
| Incognicon | November 11-13, 1983 | Ottawa, Canada |
| Fantasy Festival | November 25-27, 1983 | Dallas, TX |
| Harrycon | 1984 | Melbourne, Australia |
| Brave New Con | January 13-15, 1984 | Reston, VA |
| Wamcon | February 15-17, 1984 | |
| Con-Juration | June 1-3, 1984 | Tulsa, OK |
| Concentric '84 | November 2-4, 1984 | Columbia, MO |
| LASFS 50th Anniversary Banquet November 3, 1984 | LA, CA | |
| Alti-Ego's | April 26-28, 1985 | Denver, CO |
| Triangulum | August 30-September 1, 1985 | Milwaukee, WI |
| XIIcon | September 26-29, 1986 | Glasgow, Scotland |
| 4E 2B 70 | November 21, 1986 | Los Angeles, CA |
| Conception | 13-15 February 1987 | Leeds, UK |
| Conine | 5-7 August 1988 | Oxford, UK |
| Imagine 90 | 1990 | Rochester, NY |
| Victoricon | 1991 | Melbourne, Australia |
| CON/FUSION | February 16-18, 1991 | San Diego, CA |
| Twentycon | July, 1991 | Birmingham, UK |
| ConFictionary | September, 1991 | Adelaide, Australia |
| Altercon 666 | November 8-10, 1991 | London |
| German X-Con | December 27-30, 1991 | Dusseldorf, Germany |
| Haldecon | 13 June 1992 | Sydney, Australia |
| Farmertacon | August 8, 1992 | Tampere, Finland |
| DraCon | October 24, 1992 | Bristol, UK |
| Conyac | 1993 | Amsterdam, Netherlands |
| Continuity '93 | February 12-14, 1993 | Birmingham, AL |
| Hurricon | February 26-28, 1993 | Fort Walton Beach, FL |
| Conflation | March 5-7, 1993 | Clayton, MO |
| Con-Troll | April 16-18, 1993 | Houston, TX |
| Boise Fantasy Arts Convention | April 24-25, 1993 | Boise, ID |
| Magic Carpet Con | May 7-9, 1993 | Dalton, GA |
| CupCon | October 29-31 1993 | Melbourne, Australia |
| Cascadecon '94 | August 26-28, 1994 | Portland, OR |
| Chococon | September 2-4 1994 | Harrisburg, PA |
| Consanguinity I | October 7-9, 1994 | Lisle, IL |
| Concinnity 95 | January 29, 1995 | Melbourne, Australia |
| Attitude: The Convention | February 14-17, 1996 | Malvern, UK |
| Aliens Stole My Handbag | June 30-July 2, 2000 | Shepperton, UK |
| ConVex | September 30, 2000 | Adelaide, Australia |
| Hogmanaycon | December 29, 2000 - January 1, 2001 | Glasgow, Scotland |
| Druncon 1 | May 25-26, 2003 | Peterborough |
| Construction 2005 | July 9-10, 2005 | San Jose, CA |
| Cthulhu One | April 29-May 1, 2005 | Madison, WI |
| Tolcon | May 13-15, 2005 | Seattle, WA |
| [[Conclave (Australia) | September 30-October 3, 2005 | Adelaide, Australia |
| Wellscon | November 25, 2005 | Adelaide, Australia |
| Last Guest Con | January 28-29, 2006 | SeaTac, WA |
| Frolicon | April 13-16, 2006 | Atlanta, GA |
| Heinlein Centennial | July 6-8, 2007 | Kansas City, MO |
| ValhallaCon | September 4-6, 2009 | Bellingham, WA |
| Canberra Science Fiction Convention | May 5-6, 2011 | Canberra, Australia |
| VillainCon | October 1-2, 2011 | Perth, Australia |
| Andromeda One | September 21, 2013 | Birmingham, UK |
| JOFcon | March 28-30 2014 | Baltimore, MD |
| GalaxyCon | October 31-November 2, 2014 | Las Vegas |
| Archipelacon | June 25–28, 2015 | Åland, Finland |
| Ice and Fire Con | April 28-30, 2017 | Pembroke, VA |
| Crossingcon | June 21-23, 2019 | Montreal, Canada |
| Asimov Centennial Meetup | January 4th 2020 | NY, NY |
