Tony...
It has happened to me as well. Once I even showed up at the wrong venue for a wedding. The venue thought they had forgotten a booking and were going crazy, til I realized I was at the wrong place.

Confirmation by phone a day or two prior to a job can be a big help. Some clients call me to confirm. And, sometimes I will call, especially if the client is not a regular. But I don't do it as often as I should. The fact is, clients do appreciate a call to be sure everything is right.

eddie