I was entertaining the idea of a Halloween game during October. Thinking a Nightmare Before Christmas theme would be fun.
Alternatively got an idea from the child role in the last game. Would be neat to come up with a game where people can't be killed off (or make it much more difficult). Where the Mafia would instead have to find a specific hidden role and target them to win or make it so they could begin killing folks.
In this game, the townies would not vote out who get's killed, but who get's "unmasked" as a sort of public investigation. Instead of people getting hit, they would perhaps be neutralized from making a vote or using a power.
Still working out the details, but I would like to see a game where most everyone gets to remain IN the game, as this could really change some of the power dynamics.