Did you see this thread Accessibility & JupyterHub for education?
I am not sure if this would fit into this event or would be better as an additional one: @minrk mentioned that a lot of issues have been opened already and that one thing that has been hard is getting enough time for people who know a11y things and people who know Jupyter things to work together on them. So maybe a workshop on that topic aiming to invite Jupyter folks and a11y folks would be good.
(If you thin kit would make the proposed event too big/broad, please anyone else feel free to build on this if you think it is a good idea. I’d help out where I can.)