The largest Worldcons are not always easy to rank, because historical attendance and membership numbers were recorded unevenly. Some lists distinguish attending members from total members, and some older data is incomplete.
Table of Contents
| Quick fact | Information |
|---|---|
| Main metric | Attending members or total memberships |
| Problem | Historical data is incomplete and inconsistent |
| Useful source | Worldcon Long List notes and membership statistics |
| Why it matters | Convention growth changed operations and fan culture |
Why Attendance Is Tricky
A Worldcon may report attending membership, total membership, supporting membership, day memberships, or estimates. Comparing one year to another requires knowing which number is being used.
What Large Worldcons Changed
Larger Worldcons needed more formal operations: bigger hotels, convention centers, registration systems, accessibility planning, program grids, security, and volunteer management.
Best Research Practice
Use the Long List notes and convention reports for exact numbers, and treat old attendance figures as historical data rather than perfect statistics.
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