What happened? On 6 December 1956, India’s first Law Minister and the chief architect of India’s Constitution Dr. Bhimrao Ramji Ambedkar passed away in Delhi. Dr. B R Ambedkar Dr Bhimrao Ramji Ambedkar , more dearly known to us, the citizens of India as Babasaheb or the Father of Indian Constitution, took his last breath while in his sleep on 6 December 1956. To commemorate Dr Ambedkar ’s valuable contribution to society, this day is observed as Mahaparinirvan Diwas all across India. Maharashtra government declared December 6 a local holiday for government offices in Mumbai and suburbs to mark Mahaparinirvan Diwas, the death anniversary of Dr. B.R. Ambedkar , the architect of the Indian Constitution. Maharashtra government on Wednesday declared December 6 , on Friday, as a ... December 6 is observed as Mahaparinirvan Diwas to honor the death anniversary of Bharat Ratna Dr. B.R. Ambedkar , the architect of the Indian Constitution and a social reformer. Learn about his contributions to social justice, economic development, and Buddhism.