if you are going to eat at an alternative restaurant some night, have the courtesy to let your waiter know so we're not all waiting for you.
Amen! I hate it when that happens. We typically plan ahead so we can tell our tablemates and waiter the night before, but when a spur of the moment change happens I'll get word to the waiter before our seating time starts. It is extremely poor manners to leave everyone sitting there waiting.