28th World Science Fiction Convention
| Heicon '70, the 28th World Science Fiction Convention | |
|---|---|
| The venue for the event, the Heidelberg Stadthalle | |
| Genre | Science fiction | 
| Dates | 20–24 August 1970 | 
| Venue | Stadthalle Heidelberg | 
| Location(s) | Heidelberg | 
| Country | West Germany | 
| Attendance | ~620 | 
| Filing status | non-profit | 
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.