Republic Day is one of three national Indian holidays. It is the anniversary of the day India enacted it's own constitution in 1950, kicking out Britain's Government of India Act (1935). This is no small feat considering the Constitution of India came into effect 3 years after independence in 1947.
Why do I care?
Because there's a PARADE!
The guest of honor is usually a foreign dignitary hosted by the President of India (yes, India has a president AND a prime minister!). To show off India's military might, the parade walks several regiments of the Indian armed forces, tanks, planes and missiles through New Delhi. It starts at the presidential palace, passes by the Delhi Gate and ends at Red Fort. It also showcases regional cultures with floats and performers that follow the military procession.
The anthem of the day is, "Mile Sur Mera Tumhara," a patriotic song that debuted on Republic Day in 1988. The song is composed of the single line repeated in several different Indian languages. "Mile sur mera tumhara," roughly meaning 'mine and your tunes meet.'
This year the song was rewritten and expanded to triple the time of the original. The song went from something simple and catchy into a trendy Bollywood musical interlude. I can't say I'm not proud of the Punjabi-Sikh section at 4:50... but you can probably skip the rest. :)
Awesome blog post on the epic MSMT2 fail