There are many, many saints named Mary, Maria or Marie. You will need to be more specific. However, if you are referring to the Blessed Virgin Mary, a list of her feast days can be found by clicking on this link.
Pope Benedict I is not a saint and has no feast day.
Saint Maria Goretti's Feast Day is July 6th.
The feast day of saint Mark is April 25.
Saint Laura's Feast Day is October the 19th.
Saint Helena's feast day is August 18.
The 23rd of April is the feast day of Saint George.
Saint Christopher's feast day is July 25th.
July 24 is the feast day of Saint Charbel.
August 11 is the feast day of Saint Philomena.
November 22 is the feast day of Saint Cecilia.
The feast day of Saint Apollonia of Alexandria is on February 9.
The feast day of Saint Anastasia of Sirmium is on December 25.