As an aside stuffing your face with Turkey, eating pumpkin pie and washing it down with American Pale Ale seems a fine way to spend the day. My diary is free tomorrow if anyone has a spare place at the table.
I have worked with US based Americans for the past 10 years, I talk constantly with them, I have American friends, I have travelled all over the country. In all my life I have never ever been asked what I'm doing tomorrow or felt they believe the whole world celebrates it.