This has been a tradition since 1824.

This is a tradition celebrated by "grito" or call to arms that Father Hidalgo called out at the start of the war for independence. Parades, fiestas, fireworks, and other celebrations.

Running of the Bulls

Resolved by the Senate and House of Representatives of the United States of America in Congress assembled, that the President is hereby authorized and requested to issue annually a proclamation designating the week including September 15 and 16 as "National Hispanic Heritage Week" and calling upon the people of the United States, especially the educational community, to observe such week with appropriate ceremonies and activities.