Dev Uthani Ekadasi is observed during the waxing phase of moon or Shukla Paksha during the Kartik month (November – December). Dev Uthani Ekadasi 2015 date is November 22. Lord Vishnu goes into sleep on the Ashada Shudha Ekadasi (July – August). He remains in deep slumber during the period and this is known as the Chaturmasa period. He wakes up on the Kartik Shukla Ekadasi and this day is observed as Dev Uthani Ekadasi.
Dev Uthani Ekadashi is thus when the gods (devta) wake up after a four-month slumber. During the four-month period some Hindu communities avoid performing auspicious ceremonies. Marriages, house warming, construction of new houses are only performed after the four month period.
Thus numerous auspicious events like marriage are held on Dev Uthani Ekadasi.
On Dev Uthani Ekadasi day, an image of Lord Vishnu is drawn on the ground. Lamps are lit around it and Fruits and vegetables are offered to this fresh image. In some regions the image is covered with a big brass plate symbolizing that He is sleeping. Bhajans dedicated to Lord Vishnu is sung and he is asked to shed his sleep and wake up and bless people.
To wake the Lord, children light mustard torches at night and make lot of noise.
As it is an Ekadasi day, people observe the Ekadasi fasting.
This Ekadasi is also known as Dev Pradodini Ekadasi, Hari Prabodini Ekadasi, Uttahana Ekadasi and Bada Ekadasi.