Shravan month and Sawan month are considered very sacred in the Hindu calendar. Sawan month is dedicated to Lord Shiva. Worshiping Lord Shiva in this entire month is considered auspicious. In the month of Sawan, many types of fasts are kept to please Lord Shiva.
In the states of northern India, the month of Shravan is also known as the month of Sawan. All Mondays or Mondays falling during the month of Sawan are considered highly auspicious for fasting and are known as Shravan Somwar or Sawan Somwar Vrat. Many devotees observe a fast on Solah Somvar or Solah Somvar from the first Monday of the month of Sawan.
All Tuesdays or Tuesdays in the month of Shravan are dedicated to Goddess Parvati, the wife of Lord Shiva. The fast of Tuesday in the month of Shravan is known as Mangal Gauri Vrat. Sawan Shivratri and Hariyali Amavasya are other auspicious days of the month of Shravan.
According to Hindu mythology, when King Daksha insulted Lord Shiva, Goddess Sati, out of anger, sacrificed her body with yoga shakti at her father Daksha's house. Before leaving the body of Goddess Sati, she had vowed to have Mahadev as her husband in every birth. In her second birth, Goddess Sati was born as a daughter by the name of Parvati in Himachal and Queen Maina's house. Parvati observed a strict fast in the month of her youth, after being fasted, and pleased her and married her, only after which it became special for Mahadev.