Hi Jennifer,
I would also cancel the class and extend the unit or offer a make- up
class on another day. That’s what I do when I am sick. I always tell
the parents in the first class of the unit, on which days I won’t
teach. For example I always teach on days like Columbus Day or
President’s Day, but I won’t teach during spring break, because a lot
of students might be on a vacation.
Good luck!
Susanne