Onesie Conventions

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
Riverina Conference	8-9 August 1953	Albury, Australia
Wiscon	September 20, 1953	Fond Du Lac, WI?
Medcon	November 7, 1953	Medway, UK
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
Relaxacon	April 7-9, 1956	Carmel Valley, CA
IllWisCon	July 4-6, 1958	Chicago
Nullcon	August 1956	NY, NY
Fanarcon	December 26-28, 1958	NY, NY
Nevadacon	August 26-27, 1959	Boulder City, NV
London Symposium	October 3, 1959	London, UK
Consolacon	September 1-4, 1961	New Orleans
KingCon	1967	Kingston, ON
Melbourne Science Fiction Conference	April 12-14, 1968	Melbourne, Australia
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
NEOSFS New Years Con	December 31, 1969 -- January 1, 1971	Sandusky, OH
PresiCon	February 12-15, 1970	LA, CA
Mondo*Con	Early 1971	NY, NY
Mini-Melcon	April 9-11 1971	Melbourne, Australia
A2 Relax Icon	February 1972	Ann Arbor, MI
BYO-Con	26-28 December 1972	Melbourne, Australia
Novacon (MI)	1973	Michigan
Cal Tech Conference	March 8-9, 1974	Pasadena, CA
Medievalcon	May 25-27, 1974	Santa Barbara, CA
SF Symposium	October 22-25, 1974	Fort Collins, CO
KWEST*Con	November 1-3, 1974	Kalamazoo, MI
Infinity 74	November 29-December 1, 1974	NY, NY
No Con	1975	New Orleans, LA
Hopcon	March 7-9, 1975	Baltimore, MD
Re-KWEST-Con	July 4-6, 1975	Kalamazoo, MI
Palm Beach Con	August 30-September 1, 1975	Palm Beach, FL
Columbicon	August 8-10, 1975	Columbia, MD
Blackpool Fan Con	February 6-8, 1976	Blackpool, UK
Romecon	February 13-15, 1976	Rome, GA
Sflaggcon	June 18-20, 1976	NY, NY
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
Bunnycon	October 22-25, 1976	McAfee, NJ
Alpha Draconis	October 29-31 1976	Toronto, ON
Spring-Con	December 3-5, 1976	Washington, DC
Luunicon	1977	London, UK
Monaclave	January 28-30, 1977	Melbourne, Australia
Clayton Con	March 12-13, 1977	Lawndale, CA
Harcon	April 1-3, 1977	Harriman, TN
Yuccacon	April 15-17, 1977	Colorado State U.
Mudcon	May 8, 1977	Stony Brook, NY
Eraticon	May 28-30, 1977	Houston, TX
Nocrescon II	May 27-30, 1977	Minneapolis, MN
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
Mooncon	August 31-September 2, 1977	Florida Keys
Freddiecon	August 30-31, 1977	Fredericksburg, VA
Saltcon	October 14-15, 1977	Salt Lake City, UT
HBHS Minicon	December 10, 1977	Huntington Beach, CA
Ozymandias	June 9-11, 1978	Toronto, ONM
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
Quakecon	February 16-18, 1979	San Francisco, CA
Whatacon	February 24, 1979	San Diego, CA
Science Fiction Week-end	March 23-24, 1979	Los Angeles, CA
Just Imagicon	May 24-27, 1979	Memphis, TN
Quasarcon	june 16-18, 1979	Adelaide, Australia
Filkon I	July 27-29, 1979	Chicago, IL
SF and Space Expo	October 6-8, 1979	San Francisco, CA
Novacon 9 West	November 2-4, 1979	Albany, NY
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
Nucon	May 10-13, 1981	Kings Cross, 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
Smoffcon 1	23-25 January 1982	Melbourne, Australia
CONgestion	19-21 March, 1982	Oklahoma City, OK
LEXICON	28-31 May 1982	Leicester, UK
Fencon	October 16, 1982	Cambridge, UK
RA CON	February 4-6, 1983	Edinburgh, Scotland
Constellation Con	February 18-21, 1983	Vancouver, BC
Microcon '83	March 4-6, 1983	San Marcos, TX
Pendulum	April 22-24, 1983	Ottawa, Canada
Colorado Mountain Con	May 6-8, 1983	Leadville, CO
Shorcon	June 4, 1983	Long Island, NY
Valcon	June 10-12, 1983	Valpariso, IN
Millenium June 10-12, 1983	Toronto, ON
InVention	September 23-25, 1983	Glasgow, Scotland
R-Con	November 2-4, 1984	Rochester, NY
Incognicon	November 11-13, 1983	Ottawa, Canada
Outre-vention	November 18-20, 1983	Salt Lake City, UT
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
Petuniacon	April 20-22, 1984	Oakland, CA
Onocon '84	May 4-6, 1984	Syracuse, NY
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
Silicone	February 15-18, 1985	Edinburgh, Scotland
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
No-No-Con	February 1988	Edmonton, AB
Conine	5-7 August 1988	Oxford, UK
Octoberfeast	14-15 October 1989	York, Australia
Imagine 90	1990	Rochester, NY
Victoricon	1991	Melbourne, Australia
NoSF3	1991	New Orleans, LA
CON/FUSION	February 16-18, 1991	San Diego, CA
Twentycon	July, 1991	Birmingham, UK
Rhino	July 12-14, 1991	London, ON
ConFictionary	September, 1991	Adelaide, Australia
Philip K. Dick Celebration	19-20 October 1991	Essex, UK
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
Nocon	April 16-19, 1993	Niagara Falls NY
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
Sealcon	1994	Eindhoven, Netherlands
Misdemeanour	February 1994	Somerset, UK
Cascadecon '94	August 26-28, 1994	Portland, OR
Chococon	September 2-4 1994	Harrisburg, PA
Consanguinity I	October 7-9, 1994	Lisle, IL
Misconstrued	1995	Somerset, UK
Concinnity 95	January 29, 1995	Melbourne, Australia
Science Fiction Saturday / Evcon	May 27, 1995	Vancouver, BC
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
Reminiscon Fifty	February 9, 2002	Cardiff, Wales
Druncon 1	May 25-26, 2003	Peterborough
ReRepetercon	2004
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
Night's Edge	November 10-11, 2007	Perth, Australia
ValhallaCon	September 4-6, 2009	Bellingham, WA
Canberra Science Fiction Convention	May 5-6, 2011	Canberra, Australia
VillainCon	October 1-2, 2011	Perth, Australia
Return of the Ring	16-20 August, 2012	Loughborough University, England
Andromeda One	September 21, 2013	Birmingham, UK
JOFcon	March 28-30 2014	Baltimore, MD
GalaxyCon	October 31-November 2, 2014	Las Vegas
Operacon	March 12-15, 2015	Milwaukee, WI
Archipelacon	June 25–28, 2015	Åland, Finland
SmofCon South	December 3-4, 2016	Wellington, NZ
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