I don't understand why I would want to post a sale ahead of time. That would only encourage buyers to wait for the sale to begin to make their purchases, costing me money. Also, I want to catch the impulse buyer who see something and wants it right then. If that person sees a sale notice for the upcoming weekend, let's say, she may choose to wait in order to save a few dollars and then later decide not to purchase or simply forget to purchase. Maybe I am missing your intent? How do you see if being valuable?