On which day does the lottery fall each year in "The Lottery" by Shirley Jackson?

The official date for the annual lottery was June 27th. More populous villages start the ceremony a few days earlier so the climax coincides with the official date. The village in the center of the story starts the lottery on the official date because there are fewer participants compared to other villages. The event in that village only takes two hours to complete. The lottery commences at ten in the morning and finishes in time for lunch.
The lottery is held in the village square. The children arrive first, and they are in charge of collecting the stones. They are followed by their fathers, who congregate around the square and talk among themselves. The women arrive last and join their husbands in the square.