Recurrence pattern: every year on November 27.

Teachers' Day is observed in Spain every November 27 to honor Joseph Calasanz, a Catholic priest and educator recognized as the patron saint of the first popular Christian school in Europe. Born on September 11, 1557, Calasanz founded the first public school in modern Europe in November 1597, emphasizing the importance of free education for the poor. On this day, Spanish children express their gratitude to teachers through congratulations and special festive activities organized by schools. The celebration reflects the legacy of Calasanz, who established a complex structure of schools teaching various subjects, including Latin, native languages, mathematics, and sciences.