Where and in which year was the 'Congress of the Oppressed Nationalities' held, which was attended by Jawaharlal Nehru on behalf of the Indian National Congress?

The Karachi Session of the Indian National Congress was held in the year ________ and was presided over by ________.

Where was the 'India House' organization, founded by Shyamji Krishna Varma in the early twentieth century, based?