The most important day of Kumaranalloor Devi is Karthika star of malayalam month Vrischika (Devi's birthday).
Once, on a Karthika day of Vrischika the noble Vilvamangalam Swamiyar came to Thrissur Vadakkunnatha temple. When he reached there he understood with his divine eyes that there was not the presence of Vadakkunathan(Lord Shiva) in the sreekovil. He came out to circumambulate the temple. When he reached near the south wall, he visions the presence of Lord Shiva there. He asked Lord why came to the wall. I am seeing Kumaranalloor Devi coming after Arattu'(holy bath). Even today, the madhyana pooja (mid day pooja) in Vadakkunnatha temple is at the south wall of the temple on the day of Karthika during the month of Vrischika.
The concept is that on the Karthika day of Vrischika, all the deities came to see the return of Devi after the Arattu. Witnessing this event is said to be excellent for long life.
The yearly main festival comes in the malayalam month of vrishchikam (nov-dec). The main festival is of ten days starting with hosting of holy flag (kodiyettu) on the first day. From the second day onwards devi has special pooja's and arrattu(holy bathing) in the nearby river(meenachil). Eighth day is on malayalam astrological star bharani' and the next day; nineth day is karthika'. Karthika and is the most important day for devi and hence is known as the great thrikkarthika. On the tenth day the devi goes for the final holy bath in nattassery a nearby place and comes back with all the happiness and prosperity for the people of this village. After the arrattu the hosted holy flag is removed, and the festival completes here. During the festival days, folk and traditional arts conducted in the temple premises. The famous group percussions like panjavadyam and chenda melam with the devi's processions like arrattu in the morning and villakku in the evening are majestic.
Every year navarathri festival celebrated with special pooja's and offerings. From the first day of the navarathri festival until last day mura japam (special chanting of mantras by scholars) in the main mandapam is conducted and is unique of its kind and is very special for devi. During the navarathri festival every year mahabhagavatha sapthaha parayanam(reading of mahabhagavatham) in the leadership of bhagavatha hamsom shri maliyoor shankaran namboothiri is also conducted in the temple auditorium (oottupura). Famous scholars from different parts of kerala conducts bhajans and elequations on vedas every evening during the navarathri festival. For the last three days of navarthri festivals sangeetha aradhana (musical pooja) is also conducted in the temple premises and famous musicians from different parts of the state take part in it.
During the navarthri, festival important pooja is the sarasvathy pooja. Students from different sectors takes part in the pooja by placing their books and tools for pooja on the eighth day and taking it on the tenth day and starting their new studies. It is said that the tenth day is auspicious day to start a new study and the day is called vidyarambham meaning starting the study. This process is famous in this temple. The vidyarambham for small childrens is the main offering on the day and conducted in the leadership of bhagavatha hamsom shri maliyoor shankaran namboothiri and other scholars.
Meena puram comes on the puram star of the malayalam month meenam.
Nearby villagers from nattassery,mallussery, perumpaikattuchery comes together and gives offerings on this day. Celebrations on this day are equal to the fifth day celebrations of main festival. Brahmini pattu(a type of musical single performance), special pooja's, thalappoli(an old ritual in which ladies pickup plates decorated with flowers and lamps in front of the procession),offering of golden replica of an elephant by the village head in return of the devi's divine grace for the villagers are the main activities of the day.
Uthrittathi vallamkali (boat race) is special for the villagers of kumaranalloor and nearby place. Boat race is not a competition, people believes that on the day of uthrittathi star in malayalam month chingam, devi goes for a visit to the nearby villages through the boat and the villagers will accompany the main boat with several other boats and comes back to the starting point after a full round. On the way the worshippers offers the traditional offerings like rice parra(cylindrical shaped bowl , considered as an unit of measurment) and other agricultural products to devi. On the return journey, people wecomes devi with musical hymns called karavanchi until reaches the temple. Kumaranalloor vallamkali (boat race) is a mix of faith and tradition of the people and the customs followed are unique in kerala, the land of backwaters and boat races. The kumaranalloor ooranma devaswom is taking special interest in preserving this custom and is giving special grants for the boat race.
Dhwaja Prathishta Day (Flagstaff Day)
It is the birthday or remembrance day of installation of new golden flagstaff. Special pooja's conducted on the day at the flagstaff.
Maha shivarathry is the main festival day of lord shiva. Valiya dhara(special bath),special poojas at day time and mid night, processions on the elephant are main activities of the day.