Maudie's been given the job of creating and distributing the invitations. Each delivered in a sealed envelope so that it can be confirmed that each has been dispatched to its intended.
"We're using rather a lot of envelopes in this exercise, aren't we?" I asked Maudie when she gave me mine.
"Let's not go there."
"If you're working that day you've got to go to it."
"So why the RSVP?"
"I am only obeying orders. I don't make up the rules," replied Maudie, who has obviously asked that question before me.