Thanks for bringing up this topic. I'm helping organize the event this time, and I'm extremely socially withdrawn. So trust me, I know where you're coming from.
However from my past experience at Kuwait Global Game Jam, many people are very open and welcoming. I only came for short time, shared some thoughts with a group, and they were more than happy to get me more involved.
A good tip is to try and arrive early on the first day, before it gets too crowded. It's always harder to break into large group. I've had that feeling before. And to make it easier, once you're there, ask either for me or Dherar and we'll make sure to make it an easier introduction :)
Thing is, people here are looking to have fun making games. So they all have shared interest in talking to others, even if they relent it.