How really interesting and of course, important.
ippy
Actually, he's not wrong, ippy.
However I did note that there are no Christian writings concerning the observation of any Christian feasts before the mid second century.
I stand by that.
The Didache - the teaching of the twelve - is contempory with the later Pauline epistles - around AD80-90 at the latest.
It was part of early NT lists but rejected on two grounds: authorship and overtly 'Jewish' content.
Nevertheless it does give account of early Christian worship.
Had there been any calendar dates to celebrate, one would have thought they'd have ended up there - and they haven't.
Many such dates were invented by the bishopric to try and make up for a semi-literate following's lack of access to the writings themselves.