Dear Mrs. Town:

I do deeply apologize for my seeming rudeness in having to send the message about Monday night.
When I accepted your invitation, I stupidly forgot entirely that Monday was a holiday and that all of my own guests, naturally, were not leaving until Tuesday morning, and Arthur and I could not therefore go out by ourselves and leave them!
We were too disappointed and hope that you know how sorry we were not to be with you.

Very sincerely,
Ethel Norman.

Tuesday morning.