Vishwakarma Puja or Bishwakarma Puja is usually held in the middle of September and this year also it will be celebrated on 17th September. It is the festival of the God of Architecture and Engineering. Here are some photos of Vishwakarma Puja.
Vishvakarma is the Hindu presiding deity of all craftsmen and architects. He is the "Principal Universal Architect", the architect who fabricated and designed the divine architecture of the Universe , the Lord of Creation. ~ Source Wikipedia.