I know what you guys are feeling. You want to know NOW who is coming etc. etc. My wedding is in June and i haven't sent out my formal invites yet. STD was sent in Dec of 2011, so people know about the wedding. I really don't think people will book until March-April of this year. I do not expect people to respond immediately to RSVP (except people who have already told my FI and I that they have other things going on that weekend). I am the biggest procrastinator I know, but for a wedding I think I would be PUMPED to have an excuse to jetset anywhere. This all depends on your guests personalities I guess. Don't stress, anyone who is supposed to be there, will be. I am going to try and not to hold it against my friends that do not come, but it's going to show who my true friends are! I have a friend (big sister in my sorority) who lives in SINGAPORE, and she is 99% sure she will make it.