According to the Hindu scriptures, Shivratri is auspicious since on this night Lord Shiva performed the Tandava Nritya - the dance of primordial creation, preservation and destruction.
Sawan Shivratri is observed during the Hindu holy month of Sawan - month devoted to Lord Shiva. It falls one or two days before New Moon Day or Amavasya.
Chanting of Shiva Mantras, reciting Aarti, offering water and Bilva leaves to Shivlings and Kanwarias carrying Gangajal to Lord Shiva's shrines are the sacred activities associated with Sawan Shivratri.
The festival is also considered auspicious for those singles who are looking for their soul mates. They observe fast by taking only fruits, nuts and milk on this day.
On Chaturdashi Tithi, some devotees wear 'rudraksha' for getting favourable results and prosperity in their lives. It is widely believed that chanting some mantras on Sawan Shivratri pleases Lord Shiva.