Celebrate Thanksgiving this year with "Coale Mind," which examines the legal underpinnings of our country's national holidays. Somewhat surprisingly, they are grounded in a fairly obscure part of the U.S. Code that sets vacation policy for federal employees, rather than one of the more well-known portions of that Code or the Constitution. From there, I examine some interesting lessons that the scheduling of Thanksgiving, in particular, has to teach us about (1) the growth in the power of the federal bureaucracy since the Civil War, (2) the power of retail interests to affect public policy, and (3) the power of tradition (here, the ancient custom of a "harvest ritual" to both affect the law and become a part of it.