Papankusa Ekadashi, also known as Padmanabha Ekadasi, is observed on Shukla Paksha Ekadasi in the month of Ashwin or Ashwayuja (September – October).
Papankusha Ekadashi 2016 date is October 12.
The legend and significance or glory of Papankusa Ekadashi vrata is mentioned in the Brahmavaivarta Purana as a conversation between Lord Krishna and Yudhishtira. Read this article for Papankusha Ekadashi Vrat Katha.
On Papankusha Ekadashi day, Lord Padmanabha is worshipped. Those who perform the vrata of Padmanabha Ekadasi will be blessed with heavenly pleasures as the merits of this Ekadasi vrata give the results of visiting Punya thirthas (Sacred places).