1. First of the month of Vrishchikam(mid November).
2. Ayilyam in the month of Kanni(mid sept-mid oct).
3. From Thiruvonam to Bharani in the month of Meenam (mid March to Mid April).
4. Tenth of the month of Medam(mid of April).
How Mekkatu Mana becomes pambummekkat Mana:
There are legends about how Mekkattu Mana became Pambum Mekkattu Mana. Some legends connected with the lllam and the people there goes like this: The members in Pambummekkattu Mana were great devotees and experts in rituals and mystic spell. Still, their stark poverty made it difficult for them to meet their daily bread. At this juncture, one Namboori from the family went to the famous Thiruvanchikulam Temple and started praying to God seeking redemption from their dire verty.
Month and years passed, and one night, the Namboori had a wonderful experience. As his continuous worship was nearing twelfth year, one night he went to the sacred pond in the temple premises to fetch some water after everybody has left the temple. He was astonished to see a saintly figure standing on the steps at that peek hour and asked "Who is that?" The figure replied, "What Mekadu has to do with that? If you want water, fetch it and go." Namboori stood there spellbound because from the appearance and words of the person, he was sure that the figure is not of an ordinary human being. Then he saw something sparkling in the hands of that saintly figure and asked him "What is it?" The person's answer was a question, "Has Mekkadu seen Ruby?" When the Namboori said "No" the person asked whether he would like to see it. When he said "Yes" the person passed the precious stone to the Namboori. The stone impressed him so much that he wanted to show it to his friend Kodungallore Valiya Thampuran (a kingly status). He sought the Godly figure's permission. The figure gave permission on condition that the Namboori would come back soon.
The Thampuran was very much impressed by the Ruby that he wanted to keep it for himself. He was ready to purchase it at any price. But the Namboori was adamant not to break his word. So the Thampuran gave it back though unwillingly. Namboori reached back on time and handed over the Ruby to the person, suddenly he disappeared and the place which was bright like day light due to the glow of the ruby now turned dark. Fear and darkness ensnarled the Namboori. Within seconds he regained his sense and sight. He stepped in the sacred pond, fetched water and went back. The Godly person's identity haunted the Namboori and so he could not sleep that night. He blamed himself for not asking the person who he was; for person who had entrusted the Ruby with him, at least for some time, would surely have revealed his identity. The Namboori laid down thinking sadly about his foolishness.
At some point sleep caressed him. The Namboori woke up within Minutes and seeing the moon light he thought it was already dawn. He felt that it was already late for his bath and rushed to the sacred pond. Again, a person was standing there. Namboori as earlier asked "Who is that?" And the figure replied "What has Mekkad to do with that? Go and sleep. It is not time to take bath. It is not yet dawn." The Namboori recognized the voice and the saintly figure. He fell on the Godly figure's feet and requested "Upon Lord Shiva, reveal your identity." When Namboori mouthed Lord Shiva's name the person had no other go but to reveal his identity. He said "I am Vasuki." Then the Namboori expressed his wish to see Vasuki's real figure. Vasuki was sure that his real figure would frighten the Namboori. But, when the Namboori insisted, he shrinked his body to the size of a ring on Lord Shiva's finger.
The Namboori was shuddered at that sight and fainted. After few minutes, he regained consciousness. Then Vasuki asked, "What boon do you want?" "I wish your presence in my lllam always. Please put an end to my poverty. I have no other request," this was the Namboori's reply. Vasuki consented to his and said "Only three days remain to complete your twelve years' worship. You go back to your lllam after that. Meantime I will get the permission of Lord Shiva and will come to your Mana. Now it’s time for your Bath. Don't delay," Vasuki disappeared saying this.
Namboori completed his worship and returned to his lllam. He went to take bath and perform daily rituals by keeping his 'Olakkuda' (An umbrella made of palm leaves) in the 'Kizhakini' (Eastern portion of the house). When he came back, he saw a snake on the umbrella and was frightened. The snake came down, took the shape of the saintly person and said, "Mekkadu, don't fear. I am Vasuki. Lord Shiva is very much pleased at your honesty and sincere devotion. I am here on Lord's will. Take this Ruby which I have shown you the first day we met. Keep it here safely. As long as this Ruby remains here, poverty will not affect your Mana." Vasuki handed over the ruby to the Namboori and continued, "A Nagayakshi (serpent Goddess) will also reach here soon. Don't get feared to see her."
At this juncture, the eldest lady of the lllam, came from outside after attending a feast in a relative's home. She went inside keeping her umbrella in the verandah. Suddenly, a snake came out from that umbrella and went to the 'kizhakkini'. There it took the shape of a beautiful lady and stood close to vasuki. "Make idols of the two of us and placing them in this 'kizhakinni', daily rituals are to be performed. Consider us as the family Gods of Mekkattu Mana," continued Vasuki, "If you do so, prosperity will not leave your family. More snakes will come here and they will live somewhere in the compound. Only give freedom for them to live anywhere in this house and its compound. Special spaces are to be kept to pass urine and faeces. Spitting and washing hands in the courtyard or in the compound are not permitted. Fire should be set only in the kitchen hearth. Digging of the soil in the courtyard or in the compound is not allowed. Another house should be constructed in the next compound. Special functions are to be conducted there.
The ladies should not remain here at the time of menstruation and pregnancy. They should go to the other house. Snakes might be seen in this house and premises. But nobody should fear because those snakes will not bite the members of this house unless somebody stamps feet on them. By chance if any member gets snake site, the venom will not affect his/her body but will affect the snake back. In such cases, proper treatment should be given to the snake. Otherwise the snake may die. If the snakes bite some outsider, the family members should not treat. But treatment should be given to those suffering from diseases due to anger of snakes. Two lamps are to be lighted day-night in this 'Kizhakkini'. The oil in the lamp and the collyrium formed by continuous burning of the wick will be excellent medicine for skin diseases owing to rage of snake Gods. This information is to be passed through generations of Mekkatu Mana." Vasuki and Nagayakshi disappeared saying all this and promising to come back when the Namboori desires.
The Namboori installed the Serpent Gods in the Kizhakkini as per Vasuki's instruction. From that day, the 'Mekkattu family' came to be known as 'Pambummekkattu'. The family knew no poverty from the day Vasuki was placed in the house. Moreover their wealth increased gradually. The fame of Pambummekkattu family spread world wide. The belief became firm among people that skin diseases or other problems due to wrath of snake Gods have solutions in Mekkattu Mana.