This is a nine-day festival that comes twice in the year when the devout Jains do special type of fasting.
They eat only once in the day and the food is prepared without oil, butter, milk,sugar or salt. During these day they revere the Nav-pads, which are Arihant, Siddha, Acharya, Upadhyay, Sadhu, Gyan, Darshan, Charitra and Tappa.
Navapada Aradhana is associated with the Shripal-Mayanasundari legend. Navapada Aradhana is performed by meditating on Navapada and doing an ayambil. In an ayambil, only one meal is eaten each day of plain food without any spices, sugar, salt, oil, butter, milk, vegetables or fruits. It is performed for nine days, twice a year. It is called Ayambil Oli. It falls in the months of Chaitra (March/April) and Ashwin (September/October) of the Jain calendar. A procession of Siddhachakra is carried out in towns known as Jalayatra.
This is a complex ritual taking a half day in which a whole Siddhachakra is created on a floor using lentils. Mantras are recited along with performing puja starting in the centre of the Siddhachakra and moving towards the outside.
Ayambil Oli is a festival of 9 days celebrating and paying homage to the Navpad (The Navpad are also found in the Navkar Mantra)
These nine are Arihant, Siddha, Acharya, Upadhyaya, Sadhu, Samyak Darshan, Samyak Gnan, Samyak Charitra and Samyak Tapa, Samyag Darshan, Samyag Gyan