Subsequent to which one of the following events, Gandhiji, who consistently opposed untouchability and appealed for its eradication from all spheres, decided to include the upliftment of 'Harijans' in his political and social programme?

The Poona Pact was signed in September 1932 between Mahatma Gandhi and Dr. B. R. Ambedkar following Gandhi's fast unto death against the Communal Award's provision of separate electorates for the Depressed Classes. After the Pact, Gandhi formally committed himself to working for the upliftment of Harijans (his term for the Depressed Classes), launching the Harijan Sevak Sangh in September 1932 and the weekly journal 'Harijan' in 1933. He undertook extensive tours and campaigns against untouchability as part of his constructive programme.