I've seen discussions about when it is that the Christmas season officially starts and ends, and for the Scalzi household, it starts after dessert on Thanksgiving, and ends on Epiphany (which is Jan 6), although as a practical matter it ends whenever Krissy decides it's time to put away decorations, so, usually that means Jan 2nd or so.

@scalzi I’ve always believed that the Christmas season officially begins at the end of Macy’s Thanksgiving Day Parade.

Also, the after dinner music on Thanksgiving should be Vince Guaraldi’s score for the Charlie Brown Christmas Special.