I am in, will give it my best shot.

Some terrible theme ideas, free to an irresponsible home:

• Death is Useful – Tower defence game where instead of kills earning gold, they directly become the maze of towers
• Deep Space – Stealth game with using “portable hole” extradimentional spaces as hiding places
• Everything is Connected – xbill clone
• Isolation –Like Shelter, except you are a Glacier
  

Things I should probably do before the Saturday start time:

• Download and install a recent version of PyGame
• Acquaint myself with this new PyCharms editor everyone is talking about
• Failing that, do a practice app in Sublime to re-acquaint myself with the whole games-making process
• Failing all that, say “fuck it”, wait for Saturday and learn to make a Twine game

Clearly, I have a list addiction, but I am an enabler. If you like lists too, try Workflowy.