The Church requires that you do nothing special on any saint's feast day unless it is a feast of the Blessed Virgin Mary that is a Holy Day of Obligation. If Teresa is your patron saint or the patron saint of your parish, you may wish to assist at Mass that day or your parish may have special festivities planned to honor the saint.
Pope Benedict I is not a saint and has no feast day.
Saint Maria Goretti's Feast Day is July 6th.
Saint Christopher's feast day is July 25th.
Saint Laura's Feast Day is October the 19th.
The 23rd of April is the feast day of Saint George.
Saint Helena's feast day is August 18.
The feast day of saint Mark is April 25.
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.