https://infogalactic.com/info/Michaelmas
His feast (29 September) in the Middle Ages was celebrated as a holy day of obligation, but along with several other feasts it was gradually abolished since the eighteenth century (see FEASTS). Michaelmas Day, in England and other countries, is one of the regular quarter-days for settling rents and accounts; but it is no longer remarkable for the hospitality with which it was formerly celebrated. Stubble-geese being esteemed in perfection about this time, most families had one dressed on Michaelmas Day. In some parishes (Isle of Skye) they had a procession on this day and baked a cake, called St. Michael's bannock.
via Catholic encyclopedia: https://www.newadvent.org/cathen/10275b.htm
I'm not Catholic, but this celebration seems like a beneficial event for the soul and physical body. St. Michael slew the demonic Dragon. Awesome symbolism and the real notion that we, with the help of the Heavenly Hosts of our Lord and Savior, fight daily in the battle of Light vs Darkness.
UPDATE: Found a link to a recipe for St. Michael's Bannock: https://houseofjoyfulnoise.com/st-michaels-bannock-recipe/
For celiac reasons, I'll replace the 2 cups of wheat flour with my King Arthur gluten-free substitute and bake this bannock today in honor of Michaelmas.