I had a talk in geekcampsg 2014 last month. Geekcampsg is a yearly event for geeks and all talks are supposed to be related to any geeky stuff. I think there were about 200 - 300 attendees and talks had a lot of varieties from software to hardware.
In my talk, I introduced ES6, which I am currently using. Here is the slides. Click the slide and use arrow keys to navigate.
And also you can check the video here.
By the way, because I wanted to write the slides with markdown and also build it with ES6, I built the presentation framework from scratch.