I am having this same problem. Devs need to fix this. I have waited months now, marshal was on campaign, father is away, king is away at any given time. There is no marshal campaign going right now and finally I get the king to go to wedding city and now her father is off recruiting troops. By the time he got back we had another campaign going.
SP needs some love, its pretty annoying that basic features do not work still. I suggest making weddings real easy until you can figure out the code that is causing the problems.