Just wanted to share what I learned about invites:
When selecting an RSVP date, don't just consider when you have to give a headcount to the caterer. Also remember to think of the florist! He/she will need a table count, and they have to order flowers early and bill you. I was totally caught off guard by that.
Whoever said that there was a 90% acceptance rate for in-town guests and 80% acceptance rate for out of town guests was lying. Mine was much lower. I'm too lazy, though, to count up the exact percentages. Only 110 people are coming after we invited about 200 people.
You will be surprised by who comes and who doesn't come.
My RSVP date was three weeks before my wedding. So many people give me the answer "don't know." Two weeks out, I'm still getting "don't know." And I sent out save-the-dates 8 months prior. Even if you give ultimatums, people will find excuses.
You will receive bizarre excuses about why people haven't sent RSVPs. The worst was someone who told me he never received my invite, after he had emailed me two months prior saying that he had received it.