My wife's memory isn't what it was, any tips?

It is quiet simple my friend, you give her a calendar that is a year old, that way when she makes her appointment and writes it down, then she shows up a day late, it will actually be the correct day. That will only work if she is a day late, for a day early syndrome, you will have to purchase a calendar a year in advance. It would be called Post short term memory lose, or, Pre-term short memory lose, whichever the case may be. I hope this works for you and your forgetful wife.