I'm on the executive committee of a food coop at my uni where we sell organic foods, some Fair Trade foods, lots of dried fruits, organic grains, organic chocolates, nuts of all sorts, organic 100% pure juices, tofu, etc.
I'm also a member of a group that helps the uni put on all special events, which is a lot. I mean, any competitions, bands who come in to the bar and play, semi-big name bands who come and charge very little for tickets, etc. People need to write reviews, take photographs (
), do surveys at events, mystery shopping, help set up tables, help put up posters, etc.
The food coop thing doesn't help me meet a lot of people, but the ones I meet are all interesting and different to me. I learn things. Some clubs help you meet lots of people with a similar interest.
Personally, I think groups like an Outdoors club would be fantastic. They're very mixed gender as well. Things like "Anime Club" are not.