St. Gertrude's Day is celebrated on March 17th in honor of Saint Gertrude of Nivelles, a 7th-century abbess known for her piety and dedication to monastic life. She is often regarded as the patron saint of cats, travelers, and the mentally ill. The day is marked by various traditions, including prayers and special church services. In some cultures, St. Gertrude's Day is associated with the arrival of spring and the end of winter. People may also prepare special meals or engage in community gatherings to commemorate the day. The celebration reflects the enduring legacy of Saint Gertrude and her contributions to the Christian faith.