The recent American Thanksgiving holiday occurred during the Jewish holiday of Hanukkah for the first time in over 100 years, and the next time will be in about 80,000 years.  I think it's safe to say it'll actually never happen again, for a pretty simple reason:  Religions and societies don't last that long.  Granted, we have kind of limited data on this.  I ain't no scholar, but the oldest active religions are maybe 3000 years old, and the oldest continuous civilization is around 5000 years old.  But it would be at least a little naive to think Judaism will still be around in 80 centuries, and it would be ridiculously short-sighted to assume America will still be a nation then.  Not to mention the fact that humans will probably melt the earth with nuclear weapons or die off from a pandemic before then.  Either way, happy holidays.