Hint: The Round Table Conferences were held between 1930-1932. These conferences were a sequence of peace meetings held by the British government and Indian political leaders to discuss constitutional reforms in India.
Complete answer: B.R Ambedkar participated in all three round table conferences. B.R Ambedkar was the leader of the depressed classes and the untouchables. He fought for their rights. He worked for the upliftment of the lower castes in India. The First Round Table Conference was held in the House of the Lords in London. The Chairman was Prime Minister Ramsay McDonald. There were 58 representatives from British India and 16 from the Princely states. No one from the Indian Nation Congress attended the meeting because most of the leaders were in jail.
The Second Round Table Conference took place on 7th September 1931 in London. Mahatma Gandhi, Muhammad Ali Jinnah Sarojini Naidu, B.R Ambedkar participated in this conference along with other Indian leaders from the Congress, Muslim League and other parties. The major change in this conference was that the Indian National Congress was participating in this because of the promises made in the Gandhi-Irwin Pact. The Third Round Table Conference took place on 17th November 1932 and nothing much happened. The Congress was not invited. Few recommendations were passed during the Conference whose outcome was the Government of India Act,1935.
Note: There were no significant outcomes from the Round Table Conferences because the leaders of the Indian political parties were vested in their own interests. Although these were very important meetings. Although there were discussions regarding representation for the religious groups in India, nothing was done for the Depressed classes and they were completely eliminated from the Government of India Act 1935.