Do you have the capacity to take assignment online? Friday at 5 pm could be a good compromise.
Just be sure to couch the whole thing as "I'm doing this so that you have some extra time to work with these concepts after we cover them in class" and "snow, snow, snow."
OMG! Friday at 5! Why didn't I think of that??? (I take all assignments online.)
Silly me! Sometimes you need someone else to help you find your own @$$ with both hands.