Thaipusam!

That Thaipusam is a Hindu festival celebrated mostly by the Tamil community on the full moon in the Tamil month of Thai (Jan/Feb). It is also referred to as Thaipooyam in the Malayalam language.
Pusam refers to a star that is at its highest point during the festival. The festival commemorates both the birthday of Lord Murugan (also Subramaniam), the youngest son of Shiva and Parvati, and the occasion when Parvati gave Murugan a vel (lance) so he could vanquish the evil demon Soorapadman.
Kavadi Attam is a dance performed by the devotees during the ceremonial worship of Murugan, the Tamil God of War.[1] It is often performed during the festival of Thaipusam and emphasizes debt bondage. The Kavadi itself is a physical burden through which the devotees implore for help from the God Murugan.[2] Devotees prepare for the celebration by cleansing themselves through prayer and fasting. Kavadi-bearers have to perform elaborate ceremonies at the time of assuming the kavadi and at the time of offering it to Lord Murugan. The kavadi-bearer observes celibacy and take only pure, Satvik (uncontaminated and should not spread evil or disease in the world) food, once a day, while continuously thinking of God.
On the day of the festival, devotees will shave their heads undertake a pilgrimage along a set route while engaging in various acts of devotion, notably carrying various types of kavadi (burdens). At its simplest this may entail carrying a pot of milk, but mortification of the flesh by piercing the skin, tongue or cheeks with vel skewers is also common.