I've been having the same problem. But I'm gladly telling anyone to come because I have a set list for dinner. My travel agent group booking filled up with family and invited friends right away anyway. I have told anyone who has said "oh we are going to plan a boy trip" or "felt jealous because everyone else was booking a holiday and they weren't" I have told them they will not have a space at dinner and may have to stand at the ceremony. So far people have been okay with that. Hope that helps