Philco

For more, see Philcon (regional).

from Fancyclopedia 2 ca. 1959
Philadelphia Conference; one of the annual gatherings held, usually in November, in Philadelphia under the sponsorship of the PSFS . The title was adopted in 1939 when "convention" had come to mean something larger than the former Eastern SF gatherings, but the annual PhilCos (the longest con-series in fandom) are numbered serially counting the First and Third Easterns as 1 and 2.
from Fancyclopedia 1 ca. 1944
Philadelphia conference. The title was adopted in 1939 when "convention" had come to mean something larger than the former Eastern S-F gatherings, but annual Philcos are numbered serially counting the First and Third Easters as 1 and 2.