Due to the changes in the World Science Fiction Society rules , which reduced the lead-time from three to two years , no Worldcon site selection took place at the 2005 Worldcon . The site for the 2007 Worldcon was decided at the 2004 Worldcon in Boston under the old three year lead-time rule . The site selection for the 2008 Worldcon , the first under the new two year lead-time rule , took place at the 2006 Worldcon in Los Angeles
2006 Worldcon in Los Angeles
64th World Science Fiction Convention
63rd World Science Fiction Convention