An Anniversary is an occassion on which, if you go back to the hotel where you had our honeymoon 25 years before, you might find that it is rundown, too.
An Appointment is a waste of time because being early wastes yours and being late wastes the other person's.
A Birthday is generally celebrated in the US by having the birthday boy or girl blow germs all over a cake, and then serving it to everyone around.
15 concepts in this pillow book.