There are many, many saints named Maria, Mary or Marie so you will need to be more specific. However, if you are referring to Saint maria Goretti, her feast day is July 6.
July 26 is the feast of St. Anne.
Sometimes a feast day of a saint is on or near their death day. Since we do not know the date of death of Saint Jude, there may be no significance to the date.
September 21
April 29 is the feast day of Saint Catherine of Siena, a patron saint of Italy.
April 16 is the feast of St. Bernadette.
The feast day of a saint can be any random date or it may fall on the commemoration day of some event of the saint's life, such as their date of death, the day of their canonization or other such event.
A Saint's feast day falls on whatever day was chosen by the church. It could be a date that has significance to the Saint or a random day.
Joseph has two feast days: March 19 and May 1.
On September 29 we celebrate the feast of Saints Gabriel, Michael and Raphael the Archangels
December 13 is the feast of Saint Lucy of Syracuse.
There is no saint named Jennifer. However, there is a Saint Genevieve whose feast day is on January 3.
No. It can be any date but is usually the anniversary date of the death of the saint.