Vaikasi Visakam Havan
Vaikasi Visakam is observed as the birthday of Lord Subramanya Swamy or Murugan.
Similar to any other Hindu Festivals in India, Vaikasi Visagam also is celebrated according to the famous legend associated with it.
According to Hindu Puranas there were three asura (demon) brothers, Soorapadman, Singamuhan and Tarakan and they attained great powers through deep penance.
They were disturbing the Devas who pleaded Lord Siva for help.
As a result, Lord Shiva opened his Third Eye (Nettrikkan) - the one seen in his forehead and emanated six sparks of fire. Two of the five cosmic elements - Agni (god of fire) and Vayu (god of air), and the Devas carried these sparks to the Ganga who in turn carried them to a stream called Saravana Poigai.
In the stream, the fire sparks formed six divine male babies who were cared by six young girls called Karthigai Pengal.
Goddess Parvathi embraced these kids and they united to one with six faces and twelve hands. Consequently Lord Shanmugan (meaning one with six faces) emerged on the full moon day (Pournami in Tamil) in the month of Vaikasi. He is the embodiment of pure perception and divine knowledge.
Lord Murugan thus appeared for the special purpose of demolishing the evil spirits.
With the Sakthi Vel given by Goddess Parvathi, Subramanya (Murugan) fought the Asuras.
Eventually, on the request of Soorapadman’s wife, the Lord agreed to release her husband and made the demons as His flag (Seval Kodi - the flag with a cock emblem) and His vehicle - peacock (Mayilvahanam).
The war took place in Thiruchendur and the demon, Tharakasura, was killed in Tirupporur near Chennai.
To celebrate this, Devendra arranged the marriage of his daughter Deivanai with Lord Murugan. The battle with the demon is the story of the Kanda Sashti fast.
Hence, Vaikasi Visakam is observed at all Lord Murugan Temples in India as well as overseas to celebrated the victory of Lord Muruga over the demons as well as the Birthday of the Lord.