Most references say April 16th, but she has at least one other additional feast day on February 8th.
April 16
April 16 is the feast of St. Bernadette.
St. Bernadette Soubirous.
I hope you mean St. Bernadette. Her feast day is 16 April except in France where it is celebrated on 18 February.
The feast of St. Nicholas is on December 6.
May 1st is the feast of St. Joseph the Worker. He also has a feast day on March 19.
December 26 is the feast of Stephen.
July 26 is the feast of St. Anne.
The feast day of St. Nicholas of Myra is December 6.
April 16 is the feast day of Saint Bernadette except in France where is on February 18.
There is no saint named Lourdes. Lourdes is the name of a town in France near which the Blessed Virgin appeared to Saint Bernadette. The feast of the Our Lady of Lourdes is February 11.
After her middle name Bernarda
The feast day of St. Cyril, brother of St. Methodius, is February 14. He shares the date with St. Valentine and several other saints.