Events happen as they would in real time. E.G: Christmas Eve, Groundhog day, Your birthday, Easter, and April fools.
They're just some examples.
There is no flea market on the original Animal Crossing.
View the link below for all Animal Crossing: City Folk events.
by going on the bus on animal crossing city folk
marketable day is on the day it is
The first Monday in September. For example, in 2012, Labor day will fall on the 3rd of September in Animal Crossing.
Nintendo events
During special events.
There is no such holiday.
Go onto the official website for animal crossing on there you will find a whole calendar of events going to happen in your town.
It is February 3rd.
The Flea Market doesn't exist in the first Animal Crossing.
April 22nd