I think you need to lighten up your load a bit.
You shouldn't need to be responsible for people to learn, when you shouldn't be expected to be a wikipedia of programming languages.
All you need to do is explain pseudo-code.
Anyone who is actually interested in programming should already be looking up the millions of tutorials to whichever language they choose.
You can't impose a choice on someone if you want them to stay, otherwise, it's not as diverse, either.
Granted, just make it simple topics and it'd be fine.
You shouldn't need to be responsible for people to learn, when you shouldn't be expected to be a wikipedia of programming languages.
All you need to do is explain pseudo-code.
Anyone who is actually interested in programming should already be looking up the millions of tutorials to whichever language they choose.
You can't impose a choice on someone if you want them to stay, otherwise, it's not as diverse, either.
Granted, just make it simple topics and it'd be fine.