~So the screw up was not as bad as I thought. I'd only made a small error up front. I said that The Kalends of Primaria [the 1st] was Dec 27/Dec 28th on Leap Years in Addendum D [Calendar for A New Matriarchy]. That would start The Festival of The Turning on Dec 22nd. I guess I had a brāne fart because the latter starts upon The Solstice, which is almost always the 21st. [We're fixing it to that date to simplify matters]
I realized there was a problem a few days ago when I saw that Duonenia ended on Dec 20th. I did write out the entire thing – it's not as bad as it sounds – and found that somehow I had not transferred the mistake to the rest of the dating. That means I do not have to delete all the Matriarchal Calender entrees I've made so far. Whew!
I've gone back and corrected everything...and now I think I need a nap.