I once did something like this, not for adults but for our local Girl Guide troup (US equivalent Girl Scouts?).
I was still singing actively at the time, (around 1977/78)and really made it a reminiscence on where I had started from and how I got to where I was then.
As I recall, I started from the Uk Jazz/Skiffle movement and illustrated how it had led me to Leadbelly, Guthrie, Seeger,Jack Elliott, Clancy Bros, and then back across the Atlantic to Bert Lloyd, MacColl, the Watersons, et al.
It was hard work, but fun.
Good luck!

FC