Tlacolula has its market day ( Plaza Day ) on Sundays; the Tlacolula market facilities are open all week, on Sundays, however the market explodes to triple its size and extends to the outside of the building, in the surrounding streets to form a huge tianguis that is an ocean of color, sounds and smells. The Tlacolula market on Sunday is a must-see experience.

At the Tlacolula market will find the products associated with this town such as barbecue, yolk bread (Pan de yema), and the wrought iron, and much more. Tlacolula Market on Sundays is full of fantastic food, artisans and colorful plants, dried peppers and seeds and almost anything you can imagine. Many people from the surrounding villages come to buy and sell in Tlacolula on Sundays.

Tianguis (from Nahuatl tiyānquiztli, 'market') is the traditional market that has existed in Mesoamerica since pre-Hispanic times and has evolved in form and social context over the centuries. The heritage of the tianguis is a mixture of the mercantile traditions of the pre-Hispanic peoples of Mesoamerica, including the Aztec, and of the bazaars of the Middle East that arrived in America via Spain. The tianguis are characterized by being located semi-permanently in the streets and on days designated by uses and customs, these vary in each population, in which the local community acquires various products, from food and clothing.

Tlacolula de Matamoros, Oaxaca, Mexico