from Doomsday Clock #7 (DC, November 2018), script by Geoff Johns, art by Gary Frank, design by Amie Brockway-Metcalf, colors by Brad Anderson, letters by Rob Leigh
...which, thanks to Geoff Johns' fetish for giving dates to historical but vague DC events, means that
this happened today.
from All-Star Comics #3 (DC/All-American, Winter 1940), script by Gardner Fox, pencils and inks by E. E. Hibbard, aditional dialogue by yours little stuffed truly
So thanks, I guess, Geoff Johns, for making it canon that the first meeting of the
Justice Society of America was on
November 22, 1940. (Which was
not Thanksgiving, but the Friday before it.)