There are a number of saints named Thomas so you will need to be more specific. However, in general, it means the special day that specific saint is memorialized and remembered at Mass.
The feast of St. Thomas the Apostle is July 3.
St. Thomas Aquinas's feast day is on January 28January 28.
June 22 is the feast day of St. Thomas More.
January 28 is the feast of Saint Thomas Aquinas.
There are a number of saints named Thomas so you need to be more specific.
The Day of St. Thomas, is celebrated on July 3.
Saint Valentine's Day (the feast of the patron saint of lovers)
December 29th - the date of his martyrdom in Canterbury Cathedral, 1170.
There are many saint named Thomas. Please be specific.It depends on what St. Thomas.St Thomas the Apostle - December 21St. Thomas Becket - December 29St. Thomas Aquinas - March 7St. Thomas More - July 6St. Thomas of Villanova - September 22
March 17 is the feast of Saint Patrick.
May 16 is the feast of Saint Brendan.
Pope Benedict I is not a saint and has no feast day.