That's what I plan to do.
If you don't celebrate Labor Day in your neck of the woods, take the day off anyway. Don't worry about your boss -- I'll write you a note.
Dear _____________ (fill in boss's name),
____________ (fill in your name) won't be coming to work today because (duh!) it's Labor Day somewhere, and everybody needs a break now and then. I'm sure you understand, compassionate employer that you are.
Linda, your employee's blogging buddy
There. That ought to do it. Yes, even for you self-employed people -- don't let your boss be a jerk, either. ;)
See ya Wednesday!