Using birthday calendars is so easy. Instructions come with Everything Essential Birthday Calendars™ explaining how to set up the initial system. As an example we used B = Birthday and A = Anniversary but you can add any other initials you want for reoccurring occasions. Then add the occasion date and you are finished. Fill out one of our birthday calendars and keep it for years to come. Buy one calendar for each member of your family to use. If you have very large families, you can buy one calendar for Mom’s side of the family and one calendar for Dad’s side of the family but you will only have to fill them out once and then refer to them for years.