Thaipusam or Thaipoosam is a festival celebrated by the Tamil community on the full moon in the Tamil month of Thai.
It is a national holiday in many countries like Malaysia, Sri Lanka, Mauritius. In certain states of Malaysia and in the nations of Sri Lanka and Mauritius it is a government and a bank holiday. In Singapore, it was previously a national holiday but was removed from the official list of national holidays.
In Palani Sri Dhandayuthapani temple, 10 day Festival (Brahmotsavam) is held during ThaiPusam. Thirukalyanam (Celestial Wedding) will be held on the day before Thaipusam. On Thaipusam, Therottam will be held. Lord Muthukumaraswamy will bless devotees in Thanga Guthirai Vahanam (Golden Horse), Periya Thanga Mayil Vahanam (Golden Peacock, Theppotsavam (Float Festival) during the 10 day festival.
The word Thaipusam is a combination of the name of the month, Thai, and the name of a star, Pusam. This particular star is at its highest point during the festival. The festival commemorates the occasion when Parvati gave Murugan a Vel "spear" so he could vanquish the evil demon Soorapadman. It is commonly believed that Thaipusam marks Murugan's birthday; Some other sources suggest that Vaikhasi Vishakam, which falls in the Vaikhasi month (May/June), is Murugan's birthday.