The pad comes first
I type the weekly plan into the school system every Sunday night. I still start on a yellow pad.
Last week the pad showed me I had given the Chapter 12 reading and the quiz on the same night. The screen would have let me save it. The pad made the collision obvious because I could see both lines at once.
I moved the quiz to Thursday.
The students did not know about the pad. They only knew the quiz was not on Tuesday.

I do the same thing with a whiteboard in the kitchen. The calendar app never shows me two things fighting.