Charlotte is not a saint nor a blessed so has no feast day.
There is no saint named Charlotte. However, there are two Blessed Charlottes.
She has been declared as venerable but is not yet a canonized saint. Therefore, she has not been assigned a feast day. If and when she is beatified she will be given a feast day.
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.
November 22 is the feast day of Saint Cecilia.
August 11 is the feast day of Saint Philomena.
July 24 is the feast day of Saint Charbel.