Final answer:
Malú discussed the contribution of José Guadalupe Posada to the Mexican muralist movement at the Alterna Fiesta.
Step-by-step explanation:
Malú at the Alterna Fiesta spoke about José Guadalupe Posada and his contribution to the Mexican muralist movement. Posada was a print artist who criticized social injustices in Mexico through his graphic images, particularly during the rule of Porfirio Díaz.
His work addressed contemporary social issues and became a significant influence on muralists like Diego Rivera and José Clemente Orozco.