Thaipusam or Thaipoosam is a Tamil Hindu festival celebrated on the first full moon day of the Tamil month of Thai coinciding with Pusam star. The festival is celebrated to commemorate the victory of Hindu god Murugan over the demon Surapadman. Wikipedia
Maha Shivaratri is a Hindu festival celebrated annually in honour of the deity Shiva, between February and March. According to the Hindu calendar, the festival is observed on the fourteenth day of the first half of the lunar month of Phalguna. Wikipedia