Mahasivarathiri

Maha Shivaratri is a Hindu festival celebrated annually in honour of Lord Shiva. The name also refers to the night when Shiva performs the heavenly dance. There is a Shivaratri in every luni-solar month of the Hindu calendar, on the month's 13th night/14th day, but once a year in late winter (February/March, or phalgun) and before the arrival of Summer, marks Maha Shivaratri which means 'the Great Night of Shiva'