History of Worldcon Site Selection

Article outline:

1. Early days: No significant bidding in advance of the con. (Maybe talk at Midwestcon?) Site of following year's convention was chosen by a vote at the business session which was part of the single-track program and so, in theory, attended by everyone.
2. E.g., selection of 1949 Worldcon at Philcon I.
3. At some point nomination speeches by well-known pros started.
4. Later mail ballot was added.
5. At some point bid parties became the norm.
6. Switch to two-year lead time.
7. Switch to 3-year lead time
8. Switch back to 2-year lead time.