February 5 – México Constitution Day – Día de la Constitución
Celebrates the Promulgation of the 1857 and 1917 Constitutions.
Observance: First Monday of February.

The Constitution of México, formally the Political Constitution of the United Mexican States (Spanish: Constitución Política de los Estados Unidos Mexicanos) is the current constitution of Mexico. It was drafted in Santiago de Querétaro, in the State of Querétaro, by a constitutional convention, during the Mexican Revolution. It was approved by the Constitutional Congress on February 5, 1917. It is the successor to the Constitution of 1857, and earlier Mexican constitutions. – Source: Wikipedia.org

Statutory Holiday: Holidays observed nationwide. Employees are entitled to a day off with regular pay and schools (public and private) are closed.

More about Mexico Constitution Day, Día de la Constitución here.
https://www.eventsloscabos.com/2013/02/constitution-day-mexicio-dia-de-la-constitucion/