When was the last time India did not have any foreign head of state as Chief Guest at Republic Day celebrations before 2021?
Explanation:
The year 1966 was the last time before 2021 when India did not host any Head of State during the Republic Day parade. It was in 1966 when the then Prime Minister Lal Bahadur Shastri had suddenly died in Tashkent and new PM Indira Gandhi was sworn in just two days before Republic day, on January 24, 1966.