There is approximately no-one on HN, not even at the best managed firms with the least BS imaginable, who would not experience positive ROI from "Congrats guys, we just shipped X, let's have a celebratory dinner at $FAVORITE and I'm buying." That idea is freaking genius. It gets you instant political capital and will make sure decisionmakers actually remember X the next time it rolls around because they'll have a hundred projects to worry about but only one or two which were so important they had celebratory dinners at completion.