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The quarter days were the four dates on which servants were hired, rents became due or leases begun. It was said that harvest had to be completed by Michaelmas, marking of the end of the productive season and the beginning of the new cycle of farming, land was exchanged and debts were paid. Michaelmas came to be the traditional time for electing magistrates and also the beginning of legal and university terms.
Roast goose is the traditional Michaelmas dinner. It was believed that dining on a well fattened goose fed on the stubble from the fields after the harvest guarded against financial need in the family for the next year. Or possibly because Queen Elizabeth I was eating goose when news of the defeat of the Spanish Armada was brought to her. In celebration she said that henceforth she would always eat goose on Michaelmas Day.
More of the traditions of Michaelmas Day can be found here, here, and here.
So get rid of your debts, hire your servants, pay your rent, roast a well fattened goose, and enjoy Michaelmas Day!