Let's place the events chronologically: 1. Submission of unanimous report on Jallianwalabagh Massacre by Congress Committee (4) The Congress Inquiry Committee into the Jallianwala Bagh massacre submitted its report in March 1920. 2. Announcement of Peace terms to Turkey (3) The Treaty of Sèvres, which contained harsh peace terms for the Ottoman Empire (Turkey), was signed on May 15, 1920 (announced around that time), severely impacting the position of the Caliph and triggering widespread anger among Indian Muslims, fuelling the Khilafat movement. 3. Demise of B.G. Tilak (2) Bal Gangadhar Tilak passed away on August 1, 1920. 4. Special Session of Indian National Congress, Calcutta (1) A special session of the INC was held in Calcutta in September 1920 under the presidency of Lala Lajpat Rai. This session debated and eventually approved the Non-Cooperation programme, linking it with the Punjab grievances (Jallianwala Bagh) and the Khilafat issue.