28th World Science Fiction Convention

The 28th World Science Fiction Convention (Worldcon), also known as Heicon '70, was held on 20–24 August 1970 at the Stadthalle Heidelberg in Heidelberg, West Germany.

Manfred Kage eventually became Heicon's convention chairman, the last of more than a dozen fans who briefly held the position during the convention's rocky organizational period.

Participants
Attendance was approximately 620.

Guests of Honor

 * E. C. Tubb (UK) (pro)
 * Robert Silverberg (US) (pro)
 * Herbert W. Franke (Germany) (pro)
 * Elliot K. Shorter (fan), the 1970 TAFF winner
 * John Brunner (toastmaster)

1970 Hugo Awards

 * Best Novel: ''The Left Hand of Darkness by Ursula K. Le Guin
 * Best Novella: "Ship of Shadows" by Fritz Leiber
 * Best Short Story: "Time Considered as a Helix of Semi-Precious Stones" by Samuel R. Delany
 * Best Dramatic Presentation: News coverage of Apollo 11
 * Best Professional Magazine: Fantasy & Science Fiction
 * Best Professional Artist: Frank Kelly Freas
 * Best Fanzine: Science Fiction Review, edited by Richard E. Geis
 * Best Fan Writer: Bob Tucker
 * Best Fan Artist: Tim Kirk