At the time, Worldcons were completely run by their respective committees as independent events and had no oversight between years, and as such there was no mandate for any future conventions to repeat the awards.
Worldcons were completely run by their respective committees as independent events. This was at the time. Worldcons had no oversight between years. This was at the time. There was no mandate for any future conventions to repeat the awards. This was as such. This was at the time.