The big gate bordering the church grounds leads you to the Tlacolula market. One of Oaxaca’s biggest and oldest, the Tlacolula’s  market draws tens of thousands from all over the Valley of Oaxaca  every Sunday.
Wander around and soak it all in—the diverse crowd of buyers and sellers, and the equally manifold galaxy of merchandise. How about a hand-hewn yoke for your oxen, or a new stone mano and metate for your kitchen? If not, perhaps some live (or ground) chapulines (grasshoppers), maybe a live turkey for dinner tomorrow, or a hunk of sugarcane to chew on while you stroll?