Father's Day
Father's Day, is observed on the feast day of Fathers. It is celebrated as a public international day, like in many other countries including the U.S., on the third Sunday of June.
In Greece, like in other European countries, this day is named (Fête des Peres/Feast of Fathers)
Forefathers' Day
Forefathers' Day is a holiday celebrated in Plymouth, Massachusetts, on December 22. It is a commemoration of the landing of the Pilgrim Fathers in Plymouth, Massachusetts, on December 21, 1620. It was introduced in Plymouth, Massachusetts, in 1769.