There was someone I used to work with - Ugo, he was "our" cleaner, and also worked as a member of the support staff at Uxbridge University. Once a week he would give a formal lecture which was intended to teach Spanish to the English - his lectures were well attended, educational, and might have been useful if I actually needed to use Spanish.
Sometimes it happens that "training" or "education" can also be entertainment.
I've actually entertained that way myself - accompanying my wife, who unfortunately has little linguistic ability, to language lessons where I was somewhat ahead of the class (and a great aid to the teacher, I'm not into upstaging people). Ugo was a good teacher in more than one way!