I floated canceling Thanksgiving Day service since we always have a Wednesday night Divine Service. I thought that surely the people would rather spend Thanksgiving morning getting the turkey fixed up. But no: turns out a lot of people really enjoy having service that day.
As I mentioned in a previous post we often use the propers for a Harvest Festival (as I'm planning this year) and have also used the Votive for Thursdays from Daily Divine Service Book which focuses on the Institution of the true Eucharist. The latter makes for a sermon that writes itself: the juxtaposition of Caesar's amorphous thanksgiving proclamation and the transient meal that results and the true Thanksgiving of the Eucharist with a feast of eternal consequence.