It's right here, in the NWT Bible....
Exodus 23:14...."Three times in the year, you are to celebrate a festival to me".
Exodus 23:16...."Also, the festival of harvest of the first ripe fruits of your labors, of what you sow in the field. AND THE FESTIVAL OF INGATHERING AT THE OUTGOING OF THE YEAR", when you gather in your labors from the field".
So, on the third Thursday of November, we celebrate the "Feast of the Ingathering" by dedicating this day to giving thanks to God for the food and all the Blessings we have enjoyed throughout the year.
It's right there in their Bible, so why won't they celebrate it? Isn't that going against the Bible?