The First World Science Fiction Convention (Worldcon) was held in the Caravan Hall in New York from July 2 to July 4, 1939, in conjunction with the New York World's Fair, which was themed as "The World of Tomorrow".
Konvensi Fiksi Ilmiah Sedunia Pertama (Worldcon) diadakan di Caravan Hall, New York dari 2 sampai 4 Juli 1939, bertepatan dengan Pameran Dunia New York 1939, yang bertemakan "The World of Tomorrow" (Dunia Esok).