I have found 2 zoom groups of people discussing meditation.  One has
an average attendance of about 50.  The teacher does a guided
meditation and that is followed by open discussion.  The other group
has average of attendance of about 10 and is all discussion with
lots of it being the teacher answering questions.

I would like to find more groups like this.  Can you suggest any?

I've enjoyed SFDC https://sfdharmacollective.org/upcoming-events/calendar/

Is one of those two groups the Insight Meditation Center? https://www.insightmeditationcenter.org/