I will typically make announcements via firstclass, so be sure to check that regularly, whether you attend class or not.
Obviously, there are situations in which prior arrangement is not possible, as in a sudden acute illness, or similar emergency. In most such cases, I will require you to get an excuse from the Academic Dean. Also, I expect you to try your best to notify me, by phone or email, of your absence. Even from a hospital bed, you can usually do me the courtesy of a quick phone call.