The "JAM" stack is JavaScript, APIs, and Markup. It is relatively new, and JS devs love it because all the back-end and AWS stuff is outsourced to third parties. I've never used it myself, but that's my understanding.
I got my ticket for free at the last minute. These are my notes on the talks I caught. Like a lot of conferences, it's a lot of companies hawking their wares (none of which were super relevant to my employer) but it's good to get a lay of the land.
Videos: https://www.youtube.com/channel/UC8bRyfU7ycLXnEBfvdorpUg