The main festival of Pachalloor Sri Bhadrakali Temple known as 'NerchaThookka Mahotsavam' starts on the auspicious day of 'Makayiram' in the malayalam month 'Kumbham' and the 'Nerchathookkam' falls on the succeeding 'pooram' day (seventh day). Devotees offer 'thookam' for getting blessed to have children and for the well being of the children. The devotees who do the offering, initiate the proceedings by donating money by putting the same on the ‘pallippalaka’ on the first day of the festival. The 'Vratham', starts from this day onwards for the devotees (Devidaasa) who go around the temple hanging from the 'Thookka Villu' on the seventh day. It is the starting of 'Bhakthi' and the principles of 'Vritham' (Penace).
The 'Devi dasaas' who stay in the temple do 'namaskaaram' around the temple twice a day to enhance the 'Vrath'. On Pooram start, The 'Devi dasaas' go to the family house of pachallooramma, namely 'Valiyavila', get be-decked with flowers and garlands, come back to the temple where the goddess would preside from the 'Pachapandal', to receive her blessings.
A 'Nercha Thookkam' begins when a child, given by a devotee to the 'devi dasan' who hangs from the 'Thookka villu' tied firmly by 'Kacha', rise to the skies like a 'Krishnapparunthu', hanging from the 'Villu' spreading wings of 'Bhakthi'.
A 'Nercha thookkam' ends when the 'Villu', which is drawn around the temple by devotees, completes a circle around the temple, carrying the child held dearly by the 'Devi dasan' close to his chest, Hung from 'Nercha Villu'.
By the time the last child is taken around the temple in 'Nercha villu' and the goddess taken back as a procession inside the sanctum sanctorum, the sun would rise in the east ending a night filled with devotion and worship.
The devotees would leave the temple along with Devidasaas accompanied by the sounds of the drum beats of 'chenda' and other instruments, with a deep satisfaction that the future of their children are secure in the hands of 'Pachallooramma'.
Ladies from far and near offer 'Pongala' to the 'Devi' on the eighth day. The festival draws to an end when 'Kuruthi Tharppanam' is done on the ninth day before the Goddess after conducting 'Thatta Nivedyam' and and 'Kalankaaval'.