A competition for students and hobbyists, powered by Epic Games' very popular Unreal Development Kit (UDK), is to take place on the 4th of November. This will be in the form of a 48-hour session with the proceeds (there is a an entry fee) going to charity. It should also be noted that Epic Games themselves are supporting this game jam.
If you are learning the tool, plan to use it for a future game and can put together a team consisting of 6 to 10 people this is well worth checking out. For more information about this competition which will take place at the University of Bedfordshire, including all assorted guidelines, please visit here.