Papankusa Ekadasi is observed during waxing phase of moon (Shukla Paksha) in Ashwin month (September – October). The corresponding month in Tamil Calendar is Puratassi. Papankusa Ekadasi 2015 is on October 23 - Smarta; October 24 - Bhagavath. This Ekdashi is also known as Pasankusa Ekadasi.
Lord Vishnu in the form of Lord Ananta Padmanabha is worshipped on Papankusa Ekadasi. A person who observes this Ekadashi gets his/her wishes fulfilled and attains Moksha.
The greatness of this Ekadasi was narrated to Yudhishtira by Lord Krishna and is mentioned in the Brahmavaivarta Purana.
People help the needy and perform charity on the day.
All the usual rules associated with Ekadasi fasting are followed on the day. Some people opt for partial fasting and skip the all night vigil.