Congratulations, SSN. Word of warning: one of the wedding guests will turn out to be a bounty hunter in disguise, who will have knocked out the real guest and put him/her in a nearby dumpster, and the target has quite the bounty on his head. The hunter will be well disguised, but with some effort you should be able to root out the imposter.
Not that you'll need (or want) to, since the target is actually a cold-hearted serial killer who'll come uninvited to your party for no reason other than to make everyone's life miserable and maybe kill somebody along the way (won't be anybody you like if he does, though, so don't worry too much). Really, you'll be quite thankful for the bounty hunter's presence, and she'll be covert about taking him out, so as not to disturb everyone else. I'm really only telling you about all this just so you'll know to fish out whoever ends up unconscious in that dumpster, since he/she will probably be someone you might care a little about.