One of the problems with written word is that tone of voice is totally lost. Some people are just to literal to pick up on sarcasm - which is pretty obvious in the title (for most people).
To the teacher who believes that all calendars are put out 3 years in advance, yes many institutions do that, but not all. Particularly in the case of nursing school where outside sources are utilized for reviews or clinicals. It was my understanding from the original post that this class wasn't annouced until after the trip was scheduled. Heck our school district is toying with the idea of canceling fall break (that has been set and released for 2 months) to start school later in August instead. Will suck for people who already booked fall break vacations. Or extending the school year for snow days - we're already booked for the end of May.
I seriously can't imagine how they can require something post graduation. I'm sure they are concerned about passing rates, but if you've graduated you have met all of your obligations to that school - they can't require anything from you. Your program director is there to help you - he/she works FOR you, the student. Find out what they are willing to do before you dig your heels in to getting upset. Mind you I'm older now, and despise being told what to do - so I many be a bit more willing to endure a respectful confrontation, but you're the one paying tuition. You're the one who has met all requirements of graduating...
Congrats again - Welcome to the hardest, smelliest, exhausting and infuriating job you'll ever love!