If you are the Seattle area, the Seattle GNU Linux Conference (SeaGL, pronounced “Seagull”) is happening shortly. There’re two UEFI talks, one by PreOS Security, and one by System76.
https://osem.seagl.org/conferences/seagl2017/program/proposals/374
http://seagl.org/news/2017/09/28/QA-penglish.html
https://osem.seagl.org/conferences/seagl2017/program/proposals/326