First of all, do NOT finish your lesson planning in time.
Secondly, think of 2 really important errands that need to happen first thing on Monday.
Then, realize you haven't paid the bills or updated the checkbook.
That will pretty much ensure you get a day off to accomplish all these very important things. Your husband will agree.
And that is the story of how I got the day off to finish up all these loose ends and school starts tomorrow instead.