The friendly folks over at the My Little Game Dev forums figured that they should hold their own game development marathon, and unlike the more well-known My Little Game Jam this event lasts for two whole weeks starting today, giving you plenty of time to work on your dream fangame. There isn't a required theme in this event: you just need to show up with a completed game by the end of the event that does not feature R34 (although creepypasta is allowed, thankfully). Shame I probably won't have my pet project fangame finished in time...ah well, at least it should be out sometime this year.

Want more details on the contest? You can find them here, and once you've created a game you can submit it to this thread: http://www.mylittlegamedev.com/thread-768.html. Have fun!