In colossians, Paul says about New MOON celebrations. The WT has gone to great efforts to prove that the Jews religion had not descended from moon worship in Ur. (See the Aid book, I have not bothered looking at the Inshite book) In fact the Mosaic code did not celebrate any new moon festivals, although in certain OT passages, it is clear that the post exodus Jews still held the New Moon to be special - for consuting seers, for instance.
Having proved that this reference cannot refer to worshippers of Yahweh, it can only mean that Paul was telling the former PAGANS, that they could still celebrate their holidays, only now their festival, as the NWT put it is "celebrated to Jehovah."
Thus the whole self-righteous crap against Christmas birthdays new year, you name it is shot down in flames.
Maybe I should start marking my diary. I have a lot of celebrating to make up for...
HB