In ancient Roman religion, the god Consus was the protector of grains and storage bins, which among the Romans were subterranean silos. Since the grain was stored in holes underneath the earth, Consus' altar was also placed beneath the earth (near the Circus Maximus). It was uncovered only during the Consualia, his festival on August 21 and December 15.
One of the main events during this festival was a mule race (the mule was his sacred animal). During the festival horses and mules were garlanded with flowers, and given a rest from work. Also on this day, farm and dray horses were not permitted to work and attended the festivities.
Consus is closely connected with the fertility goddess Ops (Ops Consiva). Later he was also regarded as god of secret counsels as his name was also interpreted allegorically in relation to consilium which means council, assembly.
Found at Wikipedia