Ayudha Pooja is a day of celebration for workers. On this day, the equipment, machines, or animals that a worker uses to make a living are ceremonially blessed and decorated (hence, the rickshaws being all decked out). All machines are cleaned and serviced to keep them happy. Then on the day after Ayudha Pooja, all machines and animals are given a day of rest. This is all done as a form of worship of Vishwakarma, the architect of the world. I have just finished reading the Ramayana and I think that Vishwakarma is the coolest.