The most influential Worldcons are not only the largest. A Worldcon can matter because it began a tradition, crossed a national boundary, changed convention scale, hosted a memorable Hugo year, or crystallized a fan debate.
Table of Contents
| Quick fact | Information |
|---|---|
| First Worldcon | Nycon I, 1939 |
| First official Worldcon masquerade | Chicon I, 1940 |
| Early international milestone | Toronto, 1948 |
| First outside North America | Loncon I, 1957 |
| Useful approach | Influence means context, not just attendance |
Early Milestones
Nycon I made Worldcon real. Chicon I added an official masquerade tradition. Toronto showed that Worldcon could cross a national border.
Growth and Complexity
Later conventions such as MidAmeriCon and major Boston, Chicago, London, and Washington Worldcons showed how scale changed operations, programming, and fan expectations.
International Milestones
Worldcons outside North America expanded the map of fandom and made clear that science fiction fan culture was not limited to one country.
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