The annual session of the Indian National Congress (INC) was held in December 1920 in the Nagpur district in Maharashtra. It was presided over by C Vijayaraghavachariar. It was during this session that the INC passed the main resolution on Non-Cooperation. The crucial issues raised in this resolution included the boycott of foreign goods, schools, and courts and the surrender of titles. The promotion of harmony between Muslims and Hindus was also a prominent discussion during the session. The appointment of the fifteen-member Congress Working Committee, established to guide the Congress, was yet another significant outcome of the Nagpur session.
The 1920 Nagpur session marked the beginning of a new era in the freedom struggle history. During this meeting, the INC underwent several significant reforms that gave the party a more political and authentic stature. One of the most noticeable changes in Congress was its approach to securing freedom. Instead of its previous goal to secure Swaraj (self-government) through constitutional means, Congress decided to attain Swaraj through peaceful and legitimate means, thus committing itself to an extraconstitutional mass struggle.
Source: Indian Culture Portal