Thanks y’all for the help. I did the Category/Sub-Category method and it’s working well. That plus the FeverBee theme component made for a nice outcome.
Top-left box on the theme component displays the Topics associated with the tag lesson. The top-right component displays the next live call.
I’m working to figure out the best way to control access to the different Groups. Likely using Paid Membership Pro: Managing Discourse group membership with WP Discourse SSO
https://github.com/literatecomputing/feverbee-engagement-theme