Here's another thought, based on what you said you'd like to teach... maybe a good workshop for you to teach would be "Practical theory for beginning guitarists". It would be geared towards people who already some chords and some songs. You could introduce the concept of 1,4,5 chords and so on, and show some of the common progressions explaining why they're the same progression even if in different keys. You could explain the math behind capo use, and the concept of moving barre chords, and things like how dominant seventh chords lead back to the 1 chord.

I think a lot of people start on guitar the way I started: by learning a bunch of chords simply as memorized hand shapes, then learning chord progression for individual songs from books. The kind of basic theoretical introduction I just described can open a lot of doors for figuring out songs on your own, and being able to figure out other chords from the ones you know, and knowing how to tell other people what your capo is doing to the key.

Good luck, Marion