Mahashivratri is Lord Shiva’s favorite day. Also the most auspicious day to take any Shiv sankalpa (Resolution). Devotees on this day remain on fast or perform hour-long spiritual meditation (rituals) to commemorate Mahashivratri and be blessed with grace. Read more on wiki.
Maha Shivaratri Rishi Bodh Utsav ki Mangal Kaamnayein