Tianguis

"Tianguis was also the name of a group of Hispanic-themed markets operated by the Vons companies"

Tianguis is a Mexican word derived from the Nahua or Aztec language, used to describe an open public market. Traditionally, the word has been used to describe markets where most of the vendors are indigenous Mexican farmers and craftsmen, however the use of the word has expanded to often include flea markets and other venues frequented by itinerant vendors. The word is most often used in areas that were traditional strongholds of the Aztec empire.

"Tianguis" is one of the few words used in the Spanish language that is identical in its singular and plural forms.

Famous "tianguis"

*The "tianguis" of Chiconcuac in the northeast suburbs of Mexico City, is one of the largest traditional "tianguis" in central Mexico.
*Chilapa de Alvarez, Guerrero Saturday "tianguis", a very popular sales venue for Nahua craftspeople of the region.
*Tepito, in Mexico City, best known for its pirated merchandise, with a reputation similar to that of the old Maxwell Street market of Chicago.