What are important festivals of Ayyangars? Some households perform Lakshmi puja on days such as Deepavali, Amavasyai, etc. Because elders perform tarppanam on those days, festivals are not celebrated. Kindly list and provide a brief explanation on the festivals celebrated by our elders.

Ayyangars’ important festivals are
Vishu in the month of Chittirai
Dakshinaaya punya kalam
Upakarma
Tiruvaadippuram
In some households, Adi 18
Sri Jayanthi
During the month of Purattasi – Navarathri, and in particular Maha Navami and Vijayadasmi
Tula Vishu
Deepavali
Sankranti
Adi and Thai Amavasyai, in certain households
A few observe Karadaiyaan Nonbu
Srirama Navami
Nrisimha Jayanthi
Tirunakshatram days of Azhwars and Acharyas
These are the festivals that are celebrated. Fasting and Paranai are observed on certain festival days such as Sri Jayanthi, Sri Rama Navami, Sri Nrisimha Jayanthi, etc.
It is a practice to celebrate Deepavali as a festival and also perform tarppanam for Amavasyai. Lakshmi puja is observed in a few households.
In all festivals, it is a practice to pray to Perumal. On festival days preparing special offerings, and going to temples to worship Perumal are some of the specific practices for a festival. On the Tirunakshatram days of Azhwars and Acharyas, it is a practice to recite the pasurams of the respective Azhwars.