For those that didn't have time for pyweek (like me) - there is the ludumdare game development competition.
The ludumdare competition is similar to pyweek - it's what inspired pyweek.
The main differences are it's more "from scratch", it is only one weekend, and you have to do everything yourself - no teams. Also you can use any language - not just python, and everyone can select themes over three voting rounds.
The main idea is that One has to do all parts of game development - art, coding, sound, music etc, and to concentrate on the design of the game - rather than building engines. So it's a short burst of creativity, and junk food eating - with around 100 other people at the same time making their own games.
(img by MrFun).
LD 11 :: Weekend of April 18-20 - Currently doing round 2 of theme voting.