What is the significance of Lahore session of congress in 1929 ?

The significance of Lahore session can be understood with following points:

In December 1929, under the presidentship of Jawaharlal Nehru, the Lahore Congress formalised the demand of ‘Purna Swaraj’ or full independence for India. It was declared that 26 January 1930, would be celebrated as the Independence Day when people were to take a pledge to struggle for complete independence.