It's entirely likely I've made errors and omissions here.
October 1991 | "Eroticon Six" | Gravesend |
May 1992 | "Incon I: Inconsequential" | Derby |
November 1992 | "Novacon 22" | Birmingham |
April 1993 | "Helicon" (44th Eastercon) | Jersey |
October 1993 | "VoCon" | Gravesend |
May 1994 | "Incon II: Inconceivable" | East Midlands? |
August 1995 | "Intersection" (53rd Worldcon) | Glasgow |
April 1996 | "Evolution" (47th Eastercon) | Heathrow |
May 1996 | "Incon V: Inconsistent" | Scotch Corner |
May 1997 | "Year of the Wombat" | Nottingham |
May 1998 | "Lazlar Lyricon II" | Scotch Corner |
April 1999 | "Reconvene" (50th Eastercon) | Liverpool |
April 2001 | "Paragon" (52nd Eastercon) | Hinckley |
May 2002 | "Damn Fine Con" | Shepperton |
June 2002 | "plokta.con 2.0" | Basingstoke |
April 2003 | "Seacon03" (54th Eastercon) | Hinckley |
October 2003 | "They Came and Shaved Us" | Dundalk |
November 2003 | "Novacon 33" | Walsall |
April 2004 | "Concourse" (55th Eastercon) | Blackpool |
May 2004 | "plokta.con 3.0" | Newbury |
August 2004 | "Brentcon" | Brentford |
October 2004 | "Octocon" | Maynooth |
November 2004 | "Novacon 34" | Walsall |
February 2005 | "Redemption 2005" | Hinckley |
March 2005 | "Paragon 2" (56th Eastercon) | Hinckley |
August 2005 | "Interaction" (63rd Worldcon) | Glasgow |
November 2005 | "Novacon 35" | Walsall |
April 2006 | "Concussion" (57th Eastercon) | Glasgow |
I've omitted one-day conventions such as Picocon and Dangercon, and commercial media conventions such as the London Film and Comic Con.