How do you make connections to faculty outside your department? I feel like the answer to this question should be obvious, but it doesn't seem to be.

Anyway, in my second year on the tenure track, I find myself more confined to my corner of the ivory tower than I intended to be, and would like to branch out and meet other faculty in other areas. 

My research (in theoretical math) is very specialized, so I don't have collaborations in mind. Also I would rather not volunteer for university-wide committees, as these look rather boring and I don't find myself inspired by the administration's pet projects.

Rather, I have in mind something intellectual and fun, that recaptures some of the enjoyment of being an undergraduate and hopefully leading to making new friends. For example, semi-public lectures on chemistry, theology, art history, virtually anything intellectual, ideally followed by discussions and debates over beer... 

Obviously, the first step is to do a better job of carefully looking for opportunities at my particular university. (These have been a bit hard to suss out, but I could stand to look harder). Nevertheless I would be interested to hear success stories. What have people done to make connections outside their own field of interest?

Thank you!
I organized a beer night for tenure-track profs in our department (and this was later expanded to related departments). the basic rules were: it's once a month, anyone is welcome, and it happens even if I'm the only one at the bar :). 

Do you have one person from a different department you can start this up with ? set up a mailing list and ask around to get maybe another 1-2 people involved. Start doing this regularly, and never lose a chance to mention this when talking to professors. 

Word will spread. Tenure-track profs need support groups. Our beer night is very popular :).