Weekly recs?
A book club type thing? My mother (and I cannot believe I am about to say this) hosts a book club -- members suggest a book, and everyone reads it, then discuss it. (Why am I describing this? People know what a book club is. Sorry).
I realise people have varying levels of free time, but we could do it over a month or two -- people recommend a fanfic (agree to ratings or content etc), then we agree to read it via a vote or something, or try to read it, by a given time, then discuss it. Lay down specific rules about type, content, length etc -- a 200 chapter one in a month might be pushing it, and people might be uncomfortable about pwp or excessive sex or violence. It should be as inclusive as possible if we want to grow the community :)
We can stack them up in sequence, so this month we vote to read "When Wishes Were Ponies" and next month "Sirius Comes To Godric Hollow" and the month after that "Mister Smith Goes to Washington" (yes I am just making titles up at this point).
Have a specific thread for the given thread and discussion so it doesn't roam all over the place.
Something like that?