Bede became the butt of several raucous drinking songs; a fact that made him rather anxious. He, in one of the two surviving letters he wrote (Epiflola Apologetica ad Plegavinan Monachum), would accuse Bishop Wilfrid of accusing him of heresy by allowing one of these songs to be sung at his table.
“Haec tristi mox admistione confudit addendo videlicet quod me audires a lascivientibus rusticis inter hsereticos per pocula decantari” -- Epiflola Apologetica ad Plegavinan Monachum
This accusation of heresy is widely reported as being because everyone who was anyone knew that the incarnation occurred in the year 5500 or thereabouts. The Byzantine calendar dated the incarnation to be 1 September 5509.
This puts the creation of the everything about 168 years after Mount Mazama exploded with a force 42 times that of the 1980 eruption of Mount Saint Helens. That eruption created Crater Lake.
Today many people would make fun of people who insisted that their exact and unverifiable date for the creation of the universe should be taken seriously. I am unaware of any celebrations of the creation of the world on either September 1st or the 18th of March. Part of that is due to the fact that the Bishop Ussher would swoop in and claim that the world was created on 23 October 4004 BC, but we don’t celebrate creation day in October either. Part of that could be due to the change in calendars that occurred shortly after Ussher’s setting the incarnation date; that would have pushed the date to November 6th, but we don’t celebrate on that day either.
|Byzantine mosaic of the Creation of Adam on 1 September 5509 from
Byzantine mosaic in Monreale Cathedral, Sicily, by way of Wikipedia
My theory is that we don’t celebrate on any of these days because everyone who might throw an interesting party does not believe this crap. I have a feeling that Bede was not invited to many good parties, and probably did not throw very good ones. That in turn might have better explained the drinking songs that made fun of him.