More by design than by chance, the annual meetings of the Congress and the Muslim League took place at about the same time, during the last week of December 1916, in Lucknow. Jinnah was elected president of the Lucknow Muslim League. Although Ambika Charan Mazumdar became president of the Congress meeting that year, Tilak was the main protagonist of the pact with the Muslim League. It is significant that the Home Rule League, founded by Annie Besant and of which Tilak and Jinnah were a member, held its meeting in Lucknow at the same time. Lucknow Pact (December 1916), agreement of the National Congress of India under the leadership of Maratha leader Bal Gangadhar Tilak and the Muslim League of All-India under the leadership of Muhammad Ali Jinnah; It was adopted by Congress at its meeting in Lucknow on 29 December and by the League on 31 December 1916. The Lucknow meeting marked the reunion of the moderate and radical wings of Congress. The pact covered both the structure of the Indian government and relations between the Hindu and Muslim communities. The Lucknow Pact also helped to establish cordial relations between the two leading groups in the Indian National Congress – the “extremist” faction led by the Lal Bal Pal trio (Lala Lajpat Rai, Bal Gangadhar Tilak and Bipin Chandra Pal) and the “moderate” faction of Gopal Krishna Gokhale until his death in 1915, who was later represented by Gandhi.  Although 20 years later, Jinnah supported his own nation for Muslims, he was a member of Congress and the Muslim League in 1916, he was a collaborator of Tilak and was celebrated as an “ambassador of Hindu Muslim unity”.  It was essentially some kind of agreement between the two parties.
Muslims had to pay a high price for losing the majority in Bengal and Punjab to get some concessions. Similarly, it has been of great constitutional importance for many developments in the future. The system of representation of the Muslim community in the central and provincial parliaments, enshrined in the Lucknow Pact, was generally followed in the reforms of Montague Chelmsford. Lucknow Session of Congress 1916 was the 31st meeting of the INC. Ambica Charan Majumdar was the president of the Lucknow Session of Congress. Jinnah, then a member of both parties, played a key role in the unification of the Muslim League and Congress. Because of Jinnah`s efforts to unify the League and Congress, Sarojini Naidu gave him the title of ambassador of Hindu Muslim unity. It is also thanks to the efforts of Tilak and Annie Besant that this agreement between Congress and the League came into play, although this is very contrary to the wishes of many important nationalist leaders like Madan Mohan Malaviya. The 1916 Congress League Scheme, also known as the Lucknow Pact, was a document jointly developed by the Indian National Congress and the Muslim League of India.
In 1913, at its meeting in Lucknow – in which Mohammad Ali Jinnah participated for the first time – the League decided to collaborate with the Congress and participate in the calls for autonomy.