Q: 26th January is celebrated as

Republic Day honours the date on which the Constitution of India came into effect on 26 January 1950 replacing the Government of India Act (1935) as the governing document of India.

The Constitution was adopted by the Indian Constituent Assembly on 26 November 1949, and came into effect on 26 January 1950 with a democratic government system, completing the country's transition towards becoming an independent republic. 26 January was chosen as the Republic day because it was on this day in 1930 when Declaration of Indian Independence (Purna Swaraj) was proclaimed by the Indian National Congress as opposed to the Dominion status offered by British Regime.

It is one of three national holidays in India, the other two being Independence Day and Gandhi Jayanti.

Annually held on January 26, International Customs Day (ICD) recognizes the role of customs officials and agencies in maintaining border security. It focuses on the working conditions and challenges that customs officers face in their jobs.