El Martes Mayor de Plasencia Activity · Plasencia, Comarca de Monfragüe y su Entorno, Cáceres Image of Plasencia, not of the place itself. The Tuesday market has been held in the Plaza Mayor since the 13th century. Every year, on the first Tuesday of August, the Martes Mayor festival is held, recreating that historic market. primer martes de agosto Photo: José Luis Filpo Cabana (CC BY-SA 4.0) What to see and do in Plasencia