My response was to that of a personal invitation or to something like a wedding or whatever. However, I love when I get RSVP stuff for class reunion type things that show up like 2 days before the event. I don't bother responding to those because by the time they get that I won't be there the event will be over. I just love those. I live 12 hrs from where I went to high school. If you really want me to show up make sure I have more than 48 hrs to know about the event.