When my FI and sent out our save-the-dates at the six month mark (end of September), we invited quite a few of my colleagues, but not everyone. Basically, we chose those with whom we've socialized frequently outside of work. Now since we sent out those save-the-dates, so in the course of just a few months, we have gotten to know one of my other colleagues much better to the point where, if we'd send out save-the-dates now, I'd surely invite him and his fiancee. What do I do? I don't want to make it come across like they were B-listed (after all, I wouldn't invite him because other people cancelled -- that'd be so rude), but I don't want to offend him and his fiancee by not inviting them even though we're as close to them as to some of my other colleagues. What do you suggest?