I’m gonna need to check out that JLA issue. I’m always interested in the history of comics so thanks @darkstarz.
I don’t know the first DC comic to feature Halloween but there are covers out there that are Halloween themed such as Comic Calvacade #12 which came out on September of 1945. Here’s the cover but since it could be offensive I feel a content warning is in order.
@dogwelder9 that sounds really cool. I’ll have to check it out.