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