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Celebrations

The months of the Tamil Calendar have great significance and are deeply rooted in the faith of the Tamil Hindus. Some months are considered very auspicious while a few are considered inauspicious as well.

Some of the celebrations for each month are listed below. Dates in parentheses are not exact and usually vary by a day or two. Underneath (or beside) the months of the Hindu calendar are their Gregorian counterparts.

Festivals

The Tamil Calendar is so important to the life of Tamil-speaking people that most of the Festivals of Tamil Nadu are based on it. Some of Festivals include Tamil New Year or Puthandu in mid-April, Thai Pongal, Deepavali, Panguni Uthiram, Thirukaarthigai, Aadiperukku, Navaratri etc.
Month Days Notes
Chithirai(April) April 14 - May 14 Chitra Pournami & Varusha pirappu are the most important festivals in this month. Tamil new year and first month of the Tamil Calendar.
Vaikaasi(May) May 15 - June 14 Vaikaasi Visaakam is the most important day in this month.
Aani(June) June 15 - July 14 Aani Thirumanjanam or Aani Uttaram for Lord Nataraja is the most famous day in this month.
Aadi(July) July 15 - August 14 A most important month for women. The most auspicious days are Fridays and Tuesdays in this month, these are called Aadi Velli and Aadi Chevvai and the Aadi Amavasya. Aadi Pooram is also a special day.
Aavani(August) August 15 - September 15 An important month with many rituals. Brahmins change their sacred thread on Aavani Avittam. Each Sunday of the month is dedicated to prayers - Aavani Gnayiru.
Purattaasi(September) September 15 - October 15 An important month for Vaishnavas. Purattaasi Sani(Saturday) is an auspicious day.
Aippasi(October) October 15 - November 14 The monsoons typically start over Tamil Nadu in this month. Hence the saying, "Aippasi Mazhai, adai mazhai" - meaning "Aippasi rains are persistent rains".

Also Annaabishekam for Lord Shiva is very famous in this month. The most famous Hindu festival "Deepavali" is celebrated in this month. The Fridays of this month - Aipassi velli - are dedicated to religious observance.
Karthikai(November) November 15 - December 14 Another auspicious celebration for Murugan devotees is Thirukaarthigai. The Krithikaa Pournami is the special day of the full moon in the month of Kaarthikai, and the star is Krithikaa.

Each Monday of this month is dedicated to the worship of Lord Murugan.Every Monday is called "Somavaaram" when 108 or 1008 sangabhishekam are offered to Lord Shiva and Lord Muruga.