I think this group is significant in learning TDD and refactoring, and I'm following up and picking things up whenever I have time.
As far as I can tell,? what is being said is not as important as how often it is being said, so I think there needs to be a cadence like once every 1-2 weeks where we can post videos/topics regarding TDD and refactor to help people learn more about it.
So a couple of options I have seen it's working, like a continuous delivery youtube channel of Dave Farley, substack tidying up of Kent Beck, or Samman Technical group or Calgary Software Crafter group where we practice ensemble/TDD/refactoring.
I think there are lots of topics to talk about in terms of TDD/refactor/ensemble. However, I think it's essential to create a group of organizers so the organizers can pick up the slack from each other because constancy is the key, and keeping the flow going is essential.
Another idea is to join forces with Technical Samman Coach (or Calgary Software Crafters, shameless plugs) to have a higher impact and reach. We have a group of organizers to pick up the slack from each other and do similar things.