According to sources Nakshatra during the month of Aippasi, offering rice Annam to Lord Shiva would help yielding good production of crop, economic progress, and development of kingdom (Rajya Abhivruddhi). Hence Annabishekam (special abishekam with cooked rice) is an annual affair during the full moon day of Tamil Month Aippasi, being performed in several Temple.
Today Diwali is celebrated by Hindus, Jains and Sikhs across the globe as the "Festival of Light," in the month of aippasi where the lights or lamps signify victory of good over the evil within every human being. The festival is also celebrated by Buddhists of Nepal, particularly the Newar Buddhists. To have a wealthy and comfortable life, one has to perform Sri Lakshmi Kubera Pooja especially during Deepawali festival days (Amavasya day).
Skanda Sashti is observed on the sixth day of the bright fortnight of the
Tamil month of Aippasi. This day is dedicated to the Lord Subramanya
(Karthikeya), the festival commences six days before the Sashti day and concludes
on the day of the Sashti. The story of Skanda is found among others in the
Kumara Tantra, (kaumaaram) Mahabharatha, Ramayana, and Shiva Purana and is
retold in Kalidasa's Kumara Sambhavam.