Because they think we are mind readers.
Because they think they are so busy and they are the only people that are busy.
Because they do not like to talk on the phone.
Because they just assume you know them so well whether they will come or not.
Because they are lazy.
Because they think it is ridiculous to respond to an RSVP for a child's party.
Who knows..
I do special events and am always appalled at the people that RSVP, then do not show up and call. Or who do not RSVP and just waltz in like it is no big deal.
I can understand a few invitations being lost in the mail, but over all, there is really no polite excuse.
Just call and say, "We were sure hoping you all were going to be able to join us? Do you think you are going to be able to attend?"
Next time consider mailing the paper invite AND doing an evite..
I am sorry, they did not do you a favor by responding and now you have to call and "breastfeed" these people.
Sorry, RSVP'ing is one of my pet peeves. It is so boorish to not respond.