Lord Irwin was the viceroy who announced a vague offer of domination status for India in October 1929. In 1928, when Simon commission arrived in India, welcomed with a slogan ‘Go back, Simon’. Congress, Muslim League and all the other parties demonstrated. In order to win their support, Lord Irwin announced ‘dominion status’ for India with unstated future and also a Round Table Conference to discuss the future constitution.
NOTE – People demonstrated against Simon Commission because it didn’t have even a single Indian member. It included all the British to make changes in the functioning of the established constitutional system in India.