Lord Vishwakarma is the presiding deity of all architects. He is the official builder of all the gods' palaces, and the designer of all celestial vehicles and weapons. Hindus widely regard Vishwakarma as the god of architecture and engineering.
September 17 every year is celebrated as Vishwakarma Puja -- a resolution time for workers and craftsmen to increase productivity and gain divine inspiration for creating novel products. This ritual usually takes place within the factory premises or shop floor, and the otherwise mundane workshops come alive with fiesta. Vishwakarma Puja is also associated with the buoyant custom of flying kites. This occasion in a way also marks the start of the festive season that culminates in Diwali.
In some Indian states, Vishwakarma Puja is also observed the day after Diwali. But, according to the Bengali calendar, Viswakarma Puja falls on Monday, September 17 this year.