I *just* sent my invitations out last week and already I have gotten some responses back. (YAY USPS for getting them out so fast? I honestly thought it would take longer for them to reach folks.) I opened one yesterday from a friend of mine who when I spoke to her before sending the invitations out was not in a relationship of any sort.
Her response on my rsvp card: Ms (NAME HERE) will attend.
+ Some Poor Girl.