In which city was the conference of Khilafat Committee in 1920 held that requested Gandhiji to assume the leadership of Non-Cooperation Movement?

Explanation

Gandhiji advised the Khilafat Committee in 1920 to launch a Non-Cooperation Movement against British rule. In June, 1920, the Khilafat Committee accepted this advice at Allahabad (Now – Prayagraj) and authorised Gandhiji to lead the movement. In September, 1920, at the special session of the Congress held in Calcutta under the leadership of Lala Lajpat Rai, the decision to launch the Non-Cooperation Movement was taken.