Very good and necessary with our lives being so busy. Many moons ago I bought a perpetual calender. There is no year but simply the 12 months written on erasable pages. I fill in birthdays or anniversaries when a child is born or a wedding takes place and it is there reliably every year until I erase it. In the back is a spot for addresses, also erasable so if someone moves it can be updated easily. I don't know if they even sell these anymore.

It would be worth a shot-just know I love mine and it is somewhere around 20 yrs. old. Let me know if your idea works-you may be on to something and then I will know how to replace mine when it finally gives out.