A good way to build a close knit brigade is to involve the families in the BBQs, fun days or what ever. This allows for wife's, partners, kids to mix and socialise with the others families. It also stops to wife's & partners getting cranky because your doing a CFS thing again.
We used to have cricket / football days against the other local brigades and involve all the families, they were awesome. They usually ended at someones house in a not so sober state.