Was anyone else even aware of this? :
https://en.wikipedia.org/wiki/1972_in_comics[Beginning with] Justice League of America #103, Writer Len Wein and artists Dick Dillin and Dick Giordano craft the DC portion of a metafictional unofficial crossover spanning titles from both major comics companies [Marvel and DC]. The Marvel chapters appear with 1973 cover dates.
Each [of the three comics involved in the unofficial crossover] featured [as story characters] writers Steve Englehart, Gerry Conway, and Len Wein, as well as Wein's first wife Glynis, interacting with Marvel or DC characters at the Rutland Halloween Parade in Rutland, Vermont.
[The 3-part story] Beginning in Amazing Adventures #16 (by Englehart with art by Bob Brown and Frank McLaughlin), the story continued in Justice League of America #103 (by Wein, Dillin and Giordano), and concluded in Thor #207 (by Conway and penciler John Buscema).[8][9][10]
I've re-read the JUSTICE LEAGUE 103 issue many times, and never knew about the other two issues at Marvel that preceded and followed it.
BATMAN 237 (Dec 1971)"Night of the Reaper" by O'Neil, Adams and Giordano features as characters Phil Seuling, Gerry Conway, Dennis O'Neil, Al Weiss, and Berni Wrightson, similarly takes place at a costumed Halloween parade and party in Rutland, VT.
And a Robin backup story in BATMAN 239 (Feb 1972)by Mike Friedrich, Rich Buckler and Dick Giordano.
The JLA 103 story follows most of the same characters at the same Halloween celebration a year later (Dec 1972).
There was a second unofficial Marvel/DC crossover (which until now I thought was the first!) in AVENGERS 141-144, 147-149, written by Steve Englehart, with pencils by George Perez. The Avengers fight the Squadron Supreme (who are in all but name DC's Justice League).
