It is not known exactly when taco day originated, but tacos themselves have been around for a long time. They were first referenced by that name at the end of the 19th century, but the conquistador Cortez mentioned a meal prepared with tortillas as far back as 1520! Those would have been the soft wheat or corn tortillas. Hard taco shells are a much more recent innovation.
Taco day is usually celebrated with taco parties for friends. There are many possible combinations. Start with a base filling of beef, chicken, fish, seafood, beans, or vegetables, and then mix and match your toppings. Try your favorite combination of sour cream, guacamole, lettuce, chopped tomato, onion, salsa, and cheese for a tasty treat that’s great for sharing.