At SocieTea we sit around on Thursday evenings and drink fancy teas, make tea puns, and don't force anyone to socialise who doesn't want to. I'm proud to have facilitated this. Even though I'm no longer in charge, I still host a suitcase of tea, cups and saucers, and a tea urn, under my desk in my office.
Getting most undergraduates at Lincoln to engage was like pulling teeth, but I think the UoL Computing Society is still going. Arranged hackathons, social events, mentoring buddies, networking and careers stuff and all that jazz.
Ran the website, helped with socials, special events and regular meetings, made a paltry attempt at a society magazine (called The Bridge) but hardly anyone would write for it; did most of the dealing with the Students' Union because nobody else could be bothered.