There are several saints named Gregory so you need to be specific.
Gregory is not a patron saint.
March 17 is the feast of Saint Patrick.
Please specify which Saint Gregory. There are several.
Gregory is recognized as a saint in the Orthodox religion but not in the Catholic.
The feast of Saint Samthann of Clonbroney is December 18.
Pope Benedict I is not a saint and has no feast day.
May 16 is the feast of Saint Brendan.
Brotherhood of Saint Gregory was created in 1969.
There are dozens of saints named Gregory. Be specific.
The feast of Saint Jerome Emiliani (Saint Geronimo) is on February 8.
Saint Maria Goretti's Feast Day is July 6th.
Yes, the 29th of June is the feast of Saint Peter and Saint Paul.