 The most distinguishing festival for the town is the Feria de la Posada y la Piñata (Piñata and Las Posadas Fair), which has been held here every December since 1985.Acolman claims to be the origin of the Las Posadas tradition in Mexico as well as the "cradle" of piñatas, as they have been a tradition here for over 420 years.Both kinds of piñatas, those made with clay pots and those made entirely of paper are created here.