I would be delighted to work with you again on captions, and I'm sure your help will be very useful in other areas as well. I'll add your contact info to the list. Thanks for volunteering!
I volunteer to help out for emacsconf 2022. I would be glad to try any areas that need it. Captioning, clerical stuff on IRC/etherpad/BBB, coordination, etc. I don't have a lot of experience with video tech or the infrastructure stack you use, but if you find a need for it, I would be comfortable trying. I'll keep my ears open!