Meetings get cancelled all the time. Most times, they are cancelled last minute. Unfortunately, when this happens others inevitably find out, and then try to insert other meetings in their stead. Usually it isn't too bad. These days most meetings are via conference calls. So when you get an invite to a meeting that requires you in person, I've watched people be very off put and surprised. Half the time, the requester has no idea what the attendee has going on or where they are. This is probably a product of the area and not necessarily the general norm. The worst part of it while being in DC is that getting around the city isn't always the smoothest of adventures (okay, most times it is a crap shoot where you crap out more often than not). Many events and meetings are delayed due to people not being able to get to the location in a predictable manner.
Shantz - Director of dice rolling failure and comedic timing