Three important dates in Mexican history are celebrated:
1) September 13th honors six young cadets who fought and died defending Chapultepec Castle against U.S. invasion, fighting for their country's independence.
2) September 16th commemorates Miguel Hidalgo ringing the church bell in 1810 to call Mexicans to rise up against Spanish rule after being governed by Spain for a long time. This led to Mexican independence by 1820.
3) November 20th marks the start of the Mexican Revolution in 1910 when Porfirio Díaz had been president for 31 years, reelecting himself and not sharing power, leading Francisco Madero to call Mexicans to fight against Dí