24th World Science Fiction Convention

The 24th World Science Fiction Convention (Worldcon), also known as Tricon, was held on 1–5 September 1966 at the Sheraton-Cleveland in Cleveland, Ohio, United States. Officially, the convention was hosted by three cities in the region: Cincinnati, Ohio, Cleveland, Ohio, and Detroit, Michigan; hence the name "Tricon".

The three co-chairmen of that Worldcon each represented their city's fandom; they were Ben Jason of Cleveland, Howard DeVore of Detroit, and Lou Tabakow of Cincinnati.

Participants
Attendance was approximately 850.

Guests of Honor

 * L. Sprague de Camp
 * Isaac Asimov (toastmaster)

Programming and events
At the convention, Gene Roddenberry premiered both pilot episodes, "The Cage" and "Where No Man Has Gone Before", for his upcoming NBC TV series Star Trek.

1966 Hugo Awards

 * Best Novel (tie):
 * ...And Call Me Conrad by Roger Zelazny
 * Dune by Frank Herbert
 * Best Short Fiction: "'Repent, Harlequin!' Said the Ticktockman" by Harlan Ellison
 * Best Professional Artist: Frank Frazetta
 * Best Professional Magazine: if
 * Best Amateur Magazine: ERB-dom edited by Camille Cazedessus, Jr.
 * Best All-Time Series: the Foundation series by Isaac Asimov