The document summarizes three celebrations in Mexico:
1) September 13 is celebrated to honor six young military cadets, known as Niños Héroes, who fought against invading U.S. troops during the Mexican-American War and died defending Chapultepec Castle.
2) September 16 marks Mexico's independence day, commemorating Father Miguel Hidalgo's call to arms in 1810 that began the war for independence from Spain.
3) November 20 celebrates the beginning of the Mexican Revolution in 1910 with Francisco Madero's Plan of San Luis Potosí, which called the people to arms against the authoritarian regime of President Porfirio Díaz.