First, genres for film:

* Few Drama are pure drama, and also include some comedy, while many comedies also include drama, and romances are a subset of comedy and drama, so these can be combined:
Comedy/Drama/Romance (can also include buddy cop movies)

* Westerns and SciFi often share a theme of a frontier (location or thoughts/invention) which is often shard with Fantasy, so these can be combined into one:
SciFi, Fantasy, Westerns

Action and adventure are often related, so combine to get:
Action/Adventure

Horror

Mystery

Thriller/Suspense : Noir is often in this class

Musical/Dance​

Documentary/Mockumentary/Fake Documentary

Not Genre: can be used to show a story in any combinations of the above genre.

Animation (cartoon, stop-motion, computer animation, etc)



Here are some other proposals based on alliteration like "Noir November"

"Joking January" , "January Jape" : maybe comedies and drama

"Fictional(-Science) February" / "Fantasy February" : SciFi, Fantasy, Western

"Mysterious March" could work, or a sub-classification or people being pushed too far with "March Madness"

"Action/Adventure April"

"Mysterious May" if not used for March, otherwise "Musical May"

"Generic June" : allow for any genre

"Generic July" : allow for any Genre

"Animated August" : covers conventional animation, computer animation, mixed animation (like Who Frame Roger Rabbit)

"Suspense​ (and thriller) September"

"Ominous October" : Halloween, horror, and related films

"Noir November" : already established

"Decorative December" : already established winter-holiday related films, including New Year's Eve