Add/drop deadline was extended one day due to the snowstorm. Barry Kane, that man whose incessant Q reminders suck the life out of your reading period, let his office take a day off. However, we still had to go to class.
This brings up a bigger question though. Why do we still call it add/drop? Why not just drop? Who is still shopping classes a month into the semester? Is there any class you could walk into today, add it, and not fail? Maybe Politics of Congress. But not much else.