Ok, total newb question: it appears that game jams tend to be a meetup in person style affair, at specific locations and such, but then, as per this example, there are also virtual ones? I'm only confused because I would like to meet with people in reality, and it appears I've missed a lot of them already this year...
Online gamejams got crazy popular recently, especially when platforms like itch.io or GameJolt made hosting one super simple. Great way to learn making and finishing (!) small games fast. And plenty of various flavors to choose from:
http://www.indiegamejams.com/For "reality" meetup jams you should get in touch with your local game development community - they might be organizing something. Personally, I have never been in a real gamejam