I've ran into a bunch of people who know what AIO is... not that they are current, like me. I was introduced by friends... lead some friends to it... and met many who know about it.
Hmm... I had never thought of an AIO fan club at school.... being in HS just kinda alienates anything childish in the beginning for me and my "world", (most the school and such... must get mature... throw childish ideas out the window... whatever...). But, what you've got so far sounds really good!
To draw them gradually into current stuff, since most are not up-to-date, give them an overview of just about everything, from album 1 to 50. Then if they have anymore questions, you could answer them, and they should be up to date. Then they can smoothly roll into the new season, and not be lost!!! (Not that many could... sounds like everything is changing). They might get back into!
Just an idea... this is kinda something my brain is like... ?Ha? on... so...
Good luck on this. I'm sorta jealous....