What is "mamuralia"

In ancient Roman religion, the Mamuralia or Sacrum Mamurio ("Rite for Mamurius") was a festival held March 14 or 15, named only in sources from late antiquity. According to Joannes Lydus, an old man wearing animal skins was beaten ritually with sticks. The name is connected to Mamurius Veturius, who according to tradition was the craftsman who made the ritual shields ( ancilia) that hung in the temple of Mars. Because the Roman calendar originally began in March, the Sacrum Mamurio is usually regarded as a ritual marking the transition from the old year to the new. It shares some characteristics with scapegoat or pharmakos ritual.