I'm carefully planning 11-11-11 to have it absolutely free. But instead of faking a sickness, I'll just say to my boss I've clients to visit that day (luckily my work isn't staying in an office) and that I can't move them to any other day, but those people will be already dispatched the days before 11-11, even if I have to work extra time. So in 11-11, I just have to get up late, take a nice celebration breakfast, buy Skyrim, return home and....oooh

That way, everybody is happy