Hi Jean-Philippe,
Glad to hear WCMA is looking at starting student clubs! I'll provide some background info and thoughts.
Wikipedia Connection was started by me and some of my close friends back in 2015. None of my friends were into Wikipedia editing at the time, but were kind enough to help me get the club going. We started with hosting weekly workshops (small get-togethers with food, discussions, and editing), and hosted our first edit-a-thon that focused on improving articles related to Ohio (<
https://en.wikipedia.org/wiki/Wikipedia:Meetup/Columbus/Buckeye_Edit-A-Thon_2015>). Over time, through these events and advertising on campus, our core group of regularly attending members grew to around 10-15 members.
I think one of the big advantages of being a club at Ohio State University is its size. With around 60,000 students, we're able to find a sizable number of students who become active members of the club. We're also able to do all sorts of outreach and collaborative events across many different areas (dozens of departments, librarians, etc). One thing to note is that I've seen a disproportionate number of STEM majors (particular computer science majors) join and remain active in our club, presumingly for a mix of reasons (strong tech backgrounds / enjoy being behind computers for extended periods of time / etc.).
For a new club to be successful, I think it needs an experienced Wikipedian at the helm, in order to be (a) motivated and (b) able to teach and pass knowledge to new club members. Note that our club, which brought in 130+ attendees in the last year, only has seen 3-4 people who have prior editing knowledge. Most of our work in on-boarding and training new editors.
One of the biggest concerns is sustainability. With students graduating every year, there is a high turnover rate of leadership. With Addis and myself graduating in the last year, the current leadership learned all of their Wikipedia editing skills and knowledge from Addis and I. While I'm confident they'll do great in hosting events and whatnot, having the club continue to be successful and grow can be a challenge in the next few years.
Let me know if you want to discuss further, now or in the future :)
Cheers,