I find Facebook useful for groups, since it provides a relatively low tech barrier to their creation. (Tragically, it seems to offer no easy moderation.) In the Audio Description Discussion group, creator Alison Meyers, posted their funny 6-minute video. It demonstrates the benefit of narrative audio description, complete with color-coded open captions.

I’d read about color-coded captions, where each speaker has a distinctive color, and this is my first time seeing them in use. Very helpful. Do you use audio descriptions?

Check it out! An educational six minutes: the visual is a black screen until the end.