Vishnu, who was pleased, offered the goddess the epithet 'Ekadashi', and declared that she would be capable of vanquishing the sins of all the people of Earth.
[1] In Vaishnava tradition, it is held all those who observe a fast on the occasion and worship Ekadashi would attain Vaikuntha.
[2] According to a later story, there was once a Vaishnava king of Ayodhya called Ambarisha, who always maintained his vow of fasting for the occasion.
The king received the sage with honour, and offered him a meal, which the latter accepted, but went first to perform his ritual ablutions.
Even as Ambarisha waited for a long while, the sage did not return, and the auspicious moment of breaking his fast approached.
He decided to simply sip some water, which broke his fast, but was hoped to not prove to seem insulting to the sage.
Durvasa fled, attempting to seek the protection of Brahma and Shiva, but the two deities denied him refuge.
Special prayers from the Vedas, Naalayira Divya Prabandham, Vaikuntha Gadyam as well as the Vaikuntha Dvara Puja, Prakarothsvam (Sri Veli), Oonjal Seva (swing pooja), Oonjal Prabhandham, yagnas, discourses, and speeches are arranged at several Vishnu temples around the world on this auspicious day.
[4] In Vishnu temples, Vaikuntha Ekadashi is part and parcel of Dhanurmasam (Margaḻi) vratam and its puja.
The next most important is considered to be in Tirupati in the Tirumala hills, which houses the highly venerated abode of Venkateswara.
Vishnu, as the mulavar (central temple idol) of Ranganatha, is regarded to bless devotees in his Muthangi, an armuor of pearls, on all 20 days.
[6] The Tirumala Venkateswara Temple also has a similar concept to celebrate Mukkoti Ekadasi, as it is known in the Telugu-speaking regions.