Kalabhairavashtami, also spelt as Kalabhairav Ashtami, is observed on the eight day in the month of Margashirsha as per North Indian calendar and on Kartik Krishna Astami as per the traditional Panchangam of Andhra Pradesh, Karnataka, Maharashtra and Gujarat.
In 2015, Kalabhairav Astami date is December 3. This day is also considered as Mahakaal Bhairav Jayanti.
On Kaal Bhairav Astami day, Lord Kal Bhairav along with Shiva is worshipped with utmost devotion. In Varanasi and Ujjain, this festival is celebrated with much gaiety.
The legend or Katha of Lord Kalabhairava
Lord Kalabhairava is an aspect of Lord Shiva. When Lord Brahma became headstrong, Shiva created Kalabhairav to cut his fifth head which was on top of his four heads. Kaal Bhairav sliced off Brahmas fifth head and made Brahma the ‘Chaturmukha. To get rid of the sin of ‘Brahma hatya, Kaal Bhairo visited all holy places in the world and finally consecrated in Kasi (Varanasi) as ‘Kshetra Palaka with the order of Shiva.