Rudrabhishekam
Masa Shivratri is a day dedicated to the worship of Lord Shiva and his supreme power. His devotees observe a fast and visit temples to pay obeisance to the Lord. According to one of the legends, Lord Shiva performed the cosmic dance, the Tandava on this day. Shiva is one of the holy Hindu trinity, and he is responsible for constructive destruction, whereas Vishnu is the preserver and Brahma, the creator. Some devotees worship the Nataraja form of Lord Shiva on this day.
Since Shiva is the supreme God, he is worshipped by his devotees to ensure that the world remains protected from the evil and the negative forces. Moreover, devotees pray to him for attaining salvation or Moksha. Unless a person gets rid of the vices within, he or she wouldn't be able to achieve calm. And calm is essential for attaining Moksha, a state of eternal bliss.
Devotees start observing Vrata from Maha Shivratri and keep a fast every month on this day. The puja is performed during Nishita Kaal meaning midnight. People take a bath before performing the puja and chan shlokas dedicated to Lord Shiva while unmarried women keep a fast to get a husband of their choice.