As per religious scriptures, this Kartik Shukal Ekadeshi is also named as Dev Uthani Ekadeshi or Dev Prabodhini Ekadeshi. It is because it is said that Bhagwan Vishnu gets up this day after sleeping for 4- months. As per scriptures, during Dev Prabodhini Ekadeshi, a mandap of sugar canes is constructed and the puja of Bhagwan Vishnu is performed with proper semblance. By doing this, all the hurdles encountered during doing good deeds are negotiated and the year passes on peacefully.
Anybody , who is unable to make beet root mandap for doing Puja of Vishnu Bhagwan, can also fast by having just a Nirjal Vrat & perform Puja of Bhagwan Vishnu & recite Vishnu Sahasranam on Dev Prabodhini Ekadeshi. How so ever possible, one should recite as much Vishnu Mantra this day .
As per scriptures, on the day of Dev Prabodhini Ekadeshi, even devtas perform Pooja in the praise of Vishnu. So even, the human beings on this earth should pray during the waking of the Lord Vishnu.
As per the puranas, people who who fast during Dev Prabodhini Ekadeshi, their many generations qualify for a place in Vishnu Lok.
Anybody desirous , of undertaking Dev Prabodhini Ekadeshi Vrat should take pure vegetarian food on Dashmi ( Tenth day).
One should take an early morning bath & perform Vishnu & Lakshmi Puja. Tulsi leaves should be sprinkled on Vishnu Bhagwan but it should be borne in mind that anybody who is performing fast should not pluck the Tulsi leaves himself.
One should keep reciting the mantras even while doing any personal work during the day. Much importance has been given shastras to the fact that Bhajans kiratns are done the whole night of Dev Prabodhini Ekadeshi. By doing so, one is relieved of sins of many births . Next day , after performing the Puja of Vishnu Bhagwan, Brahmans should be feasted. After this, one can break the fast by having Tulsi leaves first and then other satwik bhojan.
Legend & lore
There was a powerful asur named Shankasur. He has caused great disturbance and distress in all three loks. After the devtas requested Bhagwan Vishnu to step in, he went to fight with Shankasur. Bhagwan Vishnu fought with him for many years. Shankasur got killed. While fighting with the Asur, Shankasur, Vishnu Bhagwan was tired, so he retired in Khirsagar to relax & take rest. After taking rest for 4 months the Bhagwan woke up during Kartik Shukal Ekadashi.
This occasion was celebrated with Vishnu Puja. The tradition started with Dev Prabodhini Ekadashi Vrat .