Vaikunta Ekadashi is one of the most important Ekadasis. Ekadashi is an auspicious day dedicated to Bhagvan Srihari Vishnu and falls on the eleventh day of every lunar fortnight in traditional Hindu calendar. In 2015, the date of Vaikunta Ekadasi is December 21. Swarga Vasal or or Paramapada opening is from 3:00 AM on December 21, 2015. Please note that in United States and UK it is marked on December 21, 2015. In Australia and New Zealand it is marked on December 22, 2015. Vaikuntha Ekadasi is observed in the Margali Month (Margazhi Masam) as per Tamil Calendar and in Pushya month as per Telugu Calendar.
Vaikuntha Ekadashi is also known as Mukkoti Ekadasi and in Kerala it is known as Swargavathil Ekadasi.
Vaikunta Ekadasi festival is more elaborately celebrated by Vaishnavites. It is more prominent for Tamil and Telugu speaking people. Fasting, keep vigil at night and passing through the Vaikunta Dwaram are the important auspicious activities on the day.
Vaikunta Ekadasi is celebrated with great importance in
Tirupati Balaji Temple, , and Bhadrachalam Sita Ramachandraswamy temple. Apart from these temples, all the temples dedicated to Bhagvan Vishnu and his incarnations in South India celebrate Vaikunta Ekadasi. Srirangam Ranganathaswamy Temple
The most important ritual on the day in temples is the opening of the Vaikunta Dwaram or Paramapada Vasal door in Vishnu Temples. This door is only opened on the Vaikunta Ekadasi day and devotees are allowed to pass through it. Symbolically the door leads to the Vaikunta - abode of Vishnu.