Colleges have long tried (with limited success) to make sure classes are in fact held on the Wednesdays before Thanksgiving break  or the Fridays before various weeks off, but many professors have reported that they call off class in part because few students show up.
At the University of Florida this year, for the first time, the Wednesday before Thanksgiving will be an official holiday, but the university is now campaigning to be sure classes are held today and tomorrow. Some students are planning to be away for all of this week. But The Gainesville Sun  reported that Bernard Mair, associate provost, told faculty members last week that they should not let vacations start early. "I'd just like to encourage you to reinforce that with your students and spread the word in your departments that Monday and Tuesday are not holidays," he told the Faculty Senate. "If students start to try to make that such, you should disabuse them of that idea."