@Matt – Here’s what the FAQ in the Exams portion of the Keep Teaching site says about this:
Can I give my course exam on a reading day?
Your exam cannot be due on a reading day, as these are days scheduled to give students time to study. (Your exam is due during your assigned exam time as seen on the registrar’s calendar). However, to give your students more flexibility to manage their own schedules you can have it available and open on a reading day.