I almost got married once. Almost. Between long distance, different goals in life and a significant age difference, it just didn't work out. We never came close to making a guest list so this wasn't something I had to think about.
I've grown up quite a bit since I called off my engagement and have a better idea of what I do/don't want in a relationship. I know sometime in the distant future marriage isn't out of the question...that's when I'll have to start worrying about who IS and ISN'T coming to the ceremony because of ancient history.