It's quite unusual to have classes on Labor Day. So I am letting you know that I'm a RIT graduate so I know a lot about RIT. Actually, it was RIT's decision to start on Labor Day because there were reasons:
1. RIT's private school.
2. easily to follow the academic calendar
3. prefer to start new week of the quarter on Monday instead of mid-week, (its true.. many professors were complaining about confusing dates).
4. don't care about Labor Day. RIT wants to have students and faculty to come on Labor Day.
5. Eh. professors and students are still complaining about it since 2001.