Purattasi is the sixth month of the Tamil calendar, which falls between mid-September to mid-October of the Gregorian calendar. It is considered a very special month and is dedicated to Lord Venkateswara (Lord Vishnu) . The month is considered auspicious for offering Tharpanam (special ritual) for our ancestors, as it is believed that only during this month do our ancestors come to earth and stay here for the first 15 days before the New moon, and the entire 15 days are auspicious for giving tharpanam or oblations for our ancestors.

Purattasi month is considered very sacred compared to other months, and it has its own significance and importance. An important celestial occurrence happened in this month, and it is believed that Lord Venkateswara appeared on earth in Purattasi Masam. The month is also known for its special rituals, such as Purattasi Saturdays, Maavilakku, Mahalaya Amavasya, and Durga Navarathri.

During Purattasi month, devotees of Lord Venkateswara observe fasting on Saturdays, and some devotees only eat vegetarian food during the month. Vinayagar Chaturthi is held in Purattasi Masam, and special pujas and prayers are observed on Saturdays in Purattasi month to please Shani Bhagavan. Lord Shani Bhagavan is a staunch devotee of Lord Venkateswara, and worshipping him on Purattasi Saturdays would fetch his blessings.

In conclusion, Purattasi month is considered very sacred in Tamil culture, and it is dedicated to Lord Venkateswara. The month is known for its special rituals, and it is considered auspicious for offering Tharpanam for our ancestors. Devotees of Lord Venkateswara observe fasting on Saturdays, and special pujas and prayers are observed to please Shani Bhagavan.