“Harvest Home” (September 1 to 30) is an old tradition that some U.S. regions keep alive (e.g., the Pennsylvania Dutch, some New England towns). In Britain and other parts of Europe, this marked the conclusion of the main harvest and a period of festivals for feasting and thanksgiving.
It was also a time to hold elections, pay workers, and collect rents. These festivals usually took place around the autumnal equinox. It was also a time for family members and workers to return to their towns for festivities.
Even today, notice that elections and Thanksgiving feasts are held in the fall! This is a continuation from long-ago traditions.