Utthana Ekadashi (Dev utthana Ekadashi) is observed on Kartik Shukla Paksha Ekadashi. In 2016, Devuthhana Ekadasi date is November 11.
This Ekadashi vrata is also called as Prabodhini Ekadasi or Bodhini Ekadashi. Legend says that on this day, Lord Vishnu awakes from Yoganidra (cosmic sleep). Utthana Ekadasi also marks the conclusion of Chaturmas vrat (observance of four holy months).
On Utthana Ekadashi day, people starts Bhishma Panchaka Vrata which is also known as Bhishma Panchakam. Tulsi Damodar Vivah is also performed on this Ekadashi.
On this day, Pandarpur kartik Palki Yatra takes place. Vishnu Sahasranama parayana and Kartika Purana parayana are the other main rituals during Utthana Ekadasi. Devotees break their Ekadasi Upavas on the next day which is known as Ksheerabdi Dwadashi.