Vishwakarma Puja (the Festival Day of Vishwakarma) is celebrated on 17 th September . The festival is observed primarily in factories and industrial areas, often on the shop floor.

Vishwakarma is known as the divine architect of world. As a mark of reverence he is not only worshipped by the engineering and architectural community but also by all professionals. It is customary for craftsmen to worship their tools in His name.

Vishwakarma Puja 2009 is celebrated by all industrial houses, artists, craftsman and weavers. The festival is observed on the Kanya Sankranti Day (September) which follows the Ganesh Puja.

According to mythology it is Vishwakarma who designed the triloka; the tripartite universe consisting of the mortal world, the heavens, and the netherworld. Vishwakarma is also credited for creating the missiles used in the mythological era, including the Vajra the sacred weapon of Lord Indra (a parallel of Zeus' thunderbolts) from the ribs of sage Dadhichi. He is also credited with the creation of the twin bows Saringa and Pinaka used by Vishnu and Siva respectivly against each other to decide who was the greater warrior.
(Wikipedia)