Sort of a blind leading the blind, eh?
You better assume starting at the level of "place mirror under nose, loose for breath" type type starting. Assume they know NOTHING and just make those with basics sit through it. Encourage questions.
Have fun.
Seriously though, more lessons like this would be highly valuable to the community. There is too much ignorance. Worse is that access to the right information is easily obtained, but people are too lazy to make the effort to look for it.
Report back how you think it went. I think this is a great thing you're trying.