Improvise, adapt, and overcome! Or at least, tell a computer how to do that. Yes, the 4th Kajam's theme is Artificial Intelligence.
AI has been used in games since at least the early '70s, becoming more popular with classics like Space Invaders (1978) and Pac-Man (1980). Genres —like RTS and FPS—from the '90s brought the development of AI in games to a new level, and with more recent titles like the Half-Life episodes we started to see quite convincing cooperative AI.
Your mission—should you choose to accept it—is to create a game using AI in some way. It doesn't have to
CRUSH ALL HUMANS be particularly complicated: if you're stuck for ideas, try tweaking your path-finding algorithms; creating a novel NPC; or just making a really hard-to-beat opponent. If that doesn't suit you, other takes on the theme are very welcome too! (Edit: In particular if you'd rather make a game where the player has to write the AI, that's also fine!)
Hey @Raindrinker, yes, that also works! Anything AI-related (or not, really; the only requirement is that you make a game and be nice, after all) is great. :)
FWIW I'd even argue that making the player write the AI still requires the developer to think about how the AI should work, so you're still gaining experience in the same areas. So all good :)
At the moment the most active place seems to be IRC: you can join us using the web interface on this site, or pointing your own IRC client at #alakajam on AfterNET :)
I don't think there is currently a discord but I might be wrong. I know there was one at some point, but it wasn't very active IIRC.