As often as possible (usually at lunch, happy hour, or while playing Street Fighter II), but we would try to avoid disturbing people at their desks unless it was urgent. Of course, there were some people who never came out to lunch or happy hour, and they probably did end up being out of the loop a little.

It kind of reminds me of what someone told me once: "If you don't smoke, drink, or do drugs, you're probably a pretty boring person."