Today, 23 September 2011 is Smarta Indira Ekadasi, Ekadasi vrata for smarta sect of Hindus. 24 September 2011 is Bhagvat Ekadashi or Vaishnav Ekadasi. It falls in Krishna Paksha of Bhadrapad month as per Marathi, Gujarati, Telugu & Kannada calendars and in Ashwin month as per Hindi calendars.
Indira Ekadasi is also known as Shraddh Ekadasi as it falls during Mahalaya Paksha or Pitru Paksha.
Indira Ekadasi vrat katha or the legend of Indira Ekadashi is associated with King Indrasena. The story of this Ekadasi is mentioned in the Brahma vaivarta Purana as a conversation between Lord Krishna and Yudhishtira.