Is it on the calendar?

This is the family calendar. Conveniently, it was in need of flipping, so I thought I'd show you. You can see that the top one is written on and all crossed off. We are now onto the second calendar.
So I washed off the top one, flipped them, and added the new dates. Whenever one of the boys needs a ride or wants me to go to something, I ask, "Is it on the calendar?" If it's not on the calendar, it won't happen.

With this system, we tend to show up at everything we are supposed to show up at, even when we don't want to go.