In my experience, teacher absences just meant substitutes, another teacher swapping over / handling two classes, or an impromptu class period spent watching som

In my experience, teacher absences just meant substitutes, another teacher swapping over / handling two classes, or an impromptu class period spent watching something on tv. I'm not sure that was much better than just telling the students in advance when you know a schedule will change and sending them to the library to study or etc.