Global Gamejam is awesome. Fact. If you're serious about game development, or just want to have a great time writing code and/or making things, then it is a great thing to get involved with. Iv'e been to a few in my time, and many years ago Simon and I helped organise the very first one in Hull.
I'm pleased to be able to report that the next GameJam is at the end of January and Adam has got the registration site up. The event is running as part of Platform Expos 2016. For Hull students the timing is really nice, as it comes towards the end of the inter-semester gap week, so it won't affect your studies. Although it might help you get a job in the games industry if you do a really good entry.
It can happen.