Mexican Independence Day is celebrated every September 16. There are celebrations all over Mexico and mazatlan is no exception. The biggest celebration takes place in the Plaza Republica downtown on the night before (Sep 15). Usually, the celebration starts around 6pm and goes until late. There are bands to listen to and near midnight everyone does the 'El Grito' call! This is called the 'Grito de Dolores' and was the call to arms that started the Mexican revolution.