Mahaparinirvan Diwas is observed on December 6 to honor Dr. B.R. Ambedkar, the architect of the Indian Constitution, on the anniversary of his death in 1956. Ambedkar was championed the rights of Dalits and fought against discrimination. The day is marked by tributes at his memorial, Chaitya Bhoomi, Mumbai, where people gather to pay respects to his legacy of social justice and equality.