31 October is celebrated as “Rashtriya Ekta Diwas” National Unity Day.
31 October – Indian Prime Minister Indira Gandhi is assassinated by her two Sikh security guards. .
31 October – 3 November An estimated 2,700-10,000 Sikhs killed during the anti-Sikh riots in Delhi and other areas; mobs loot and damage several Sikh homes, businesses and Gurdwaras in response to the assassination of Indira Gandhi
31 October – Birth Anniversary of Sardar Vallabhbhai Patel – The Iron Man of India. He was the one man who got 550 states and territories to form the united Republic of India.
1895 — C.N. Nayudu, first Indian cricket Test captain, was born
1943 — Oommen Chandy, Chief Minister of Kerala, was born