Slight mix-up

The secretary/receptionist was finally back at the Conservatory yesterday. "Oh," she said, "I had you in my computer as starting at 8:00."
That was why Carmina said, "We have the hall until 8." Which she then amended, saying, "But we won't be done by then."
I didn't tell her how upset I was. She's just out of college.
I said "Is that the only calendar?" and it is.
I'll talk to the director, and assign a monetary amount to my distress to be deducted from next month's fee as well as their loss of this month's money.
Then he can tell the girl to print up a calendar for everyone to review.