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From SCIFIPEDIA
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The World Science Fiction Convention (WorldCon) is the longest-running and one of the oldest science fiction fan conventions in fandom. The Nebula Awards are presented at WorldCons.
Traditionally, WorldCon is held at or near Labor Day weekend.
When a WorldCon is not held in North America, a NASFiC will be held in the U.S.
WoldCon, NASFiC and Nebula Awards are all controlled by the Cambridge, Massachusetts-based World Science Fiction Society
External link
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