Using a calendar also helps us with school and save us money by avoiding late fees. DS1 has had issues with doing school work. He is extremely smart and gets bored easily. We have had him start using his own pocket calendar to mark down assignments and have the teachers mark off on them as well to show us that he is not lying about assignments. It may sound harsh, but he has a bright future as long as he will apply himself. I would much rather him be frustrated with us now for having to get the agenda signed, than for him to be frustrated because he can't afford to live on his own as an adult. We want our children to not have to struggle like we have had to do.
We have a lot of upcoming doctor appointments. The calendar is my best friend. The color system makes it so much easier to keep up with getting everyone where they need to be. My calendar may be full but so it my heart.