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 (except for the years 1942 to 1945, during World War II). 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.
Panel discussions on a wide range of topics pertaining to speculative fiction (SF) literature; film, audio and other media; art; graphic stories; fandom and fannish hobbies; science, technology, and society; costuming, gaming, and music
Socializing in the "con suite", convention bars, and at parties (typically run by other conventions or bidders, clubs, publishers/magazines, and by private individuals)
Speeches or other presentations by the Guests of Honor and other program participants
Other business of the World Science Fiction Society, including voting on the location of future Worldcons and North American Science Fiction Conventions (NASFiCs, which occur when the Worldcon is overseas) and any changes to the WSFS Constitution, which are made at WSFS business meetings during the convention