a place for zinesters - writers and readers
This isn't necessarily what I was remembering, but it appears that there's a Mail Art Day, as well. Dec. 5 seems to be that international holiday.
Art's Birthday, mentioned above, is Jan. 17. I'm offering these precursors as examples to consider... and because it might be cool to have this month you're proposing somehow overlap or embrace these other events.
Sounds like a good idea. What you may consider doing as part of IZM is to highlight issues with press freedom (and freedom of expression in general). I know in Malaysia that the zine scene is likely not as big as elsewhere (though I think there are punk zines being distributed underground) because the media is tightly controlled by Government regulations and young people have been arrested for spurious charges of "destroying national security" or "deviant behaviour" or other such nonsense. (That, and since there's not really too many options for free photocopies, young people generally don't want to have a financial loss.) It's ironic given that Malaysia's independence came about through activism via underground publications - the "Zines" of the past.
The Internet is not regulated in Malaysia and blogs have taken off as youth and counterculture's main form of expression and communication. Some bloggers have even made parliament because of their blogs! However, this has raised the Gov's ire, and some of those bloggers have been detained and/or jailed.
I sometimes feel that zinesters in the West don't quite understand just how much privilege they have to be able to openly produce and distribute their zines, and don't quite appreciate the struggles other countries or cultures have.