I attended Global Game Jam 2015 at the UT Austin. Austin has a thriving game development community, and I estimate at least 60-70 people turned up for the weekend. Corporate sponsors made it rain free Red Bull and pizza at various times, providing welcome refreshment/energy.
I had the pleasure of working with Tom Long, Stuart Imel, Kez Laczin, and Keith McCormic. Our game was Dino Rampage, where the player controls a schoolbus in a doomed attempt to escape a dinosaur park. It can be played here