the 13th day; the function of arattu - ceremonial bath takes place at the tank
called Arattukulam. Udayanapurathappan comes again for a joint bath at the Kulam,
so the same fanfare is repeated. It is after bath, Koodi puja - Joint worship
ceremony is conducted with several rituals lasting for hours. This is another
unique tradition the temple has been observing since ages.
As this time is
deemed extremely auspicious, many asthikas prefer celebrating auspicious
functions, on this day. Several types of Vazhivadhus are performed along with
annaprasana and Tulabharam. Needless to repeat the heavy rush needs regulation
by special squads of security personnel. Another interesting feature observable
now is Vaikatappan's going to the seat of Udayanapurathappan at Udayanapuram
following the Arattu ceremony. There again the holy bath and Koodi puja get
repetition. Lusty participation of the devotees is seen here too.