11th day of each fortnight according Hindu calendar is called Ekadashi (एकादशी). A month has two fortnights. They are called Krishna Pakshya (कृष्ण पक्ष) and Shukla Pakshya (शुक्ल पक्ष). The full moon night is called Purnima (पुर्णिमा) and new moon night is called Aaunshi/Amavashya (औंशी/अमावस्या). Within a year there are usually 24 ekadashis i.e. two ekadashis in each month. But in case of Malamaas (मलमास) it can be up to 26. Each Ekasadhi day have their own worshiping procedure and legend behind them.
Harishayani Ekadashi (हरिशयनी एकादशी) or Devshayani Ekadashi (देवशयनी) in Ashad Shukla Ekadashi (अषाढ २४, २०७१) (July 8, 2014)
Kamika Ekadashi (कामिका एकादशी) in Shrawan Krishna Ekadashi (श्रावण 6, 2071) (July 22, 2014)
Putrada Ekadashi (पुत्रदा एकादशी) in Shrawan Shukla Ekadashi (श्रावण 22, 2071) (Aug 7, 2014)
Aja Ekadashi (अजा एकादशी) in Bhadra Krishna Ekadashi (भदौ 5, 2071) (Aug 21, 2014)
Paribartini Ekadashi (परिवर्तिनी एकादशी) in Bhadra Shukla Ekadashi (भदौ 20, 2071) (Sep 5, 2014)
Indira Ekasadhi (इंदिरा एकादशी) in Aswin Krishna Ekadashi (असोज 3, 2071) (Sep 19, 2014)
Papankush Ekadashi (पापांकुश एकादशी) in Aswin Shukla Ekadashi (असोज 18, 2071) (Oct 4, 2014) Next day of Vijaya-Dashami
Rama Ekadashi (रमा एकादशी) in Kartik Krishna Ekadashi (कार्तिक 2, 2071) (Oct 19, 2014)
Haribodhini Ekadashi (हरिबोधिनी एकादशी) or Prabodhini Ekasadhi (प्रबोधिनी एकादशी) in Kartik Shukla Ekadashi (कार्तिक, 2071) (Nov 3, 2014)
Utpatika Ekadashi (उत्पतिका एकादशी) or Utpanna Ekadashi (उत्पन्ना एकादशी) in Mangsir Krishna Ekadashi (मङ्सिर, 2071) (Nov 18, 2014)
Mokshada Ekadashi (मोक्षदा एकादशी) in Marga Shukla Ekadashi (मङ्सिर, 2071) (Dec 2, 2014)
Safala Ekadashi ( सफला एकादशी) in Poush Krishna Ekadashi (पौष, 2071) (Dec 18, 2014)
Putrada Ekadashi (पुत्रदा एकादशी) in Poush Shukla Ekadashi (पौष) (Jan 1, 2015)
Sattila Ekadashi (षटतिला एकादशी) in Magh Krishna Ekadashi (माघ) (Jan 16, 2015)
Bhima Ekasadhi (भीमा एकादशी) or Jaya Ekasadhi (जया एकादशी) in Magh Shukla Ekadashi (माघ) (Jan 30, 2015)
Bijaya Ekasadhi (विजया एकादशी) in Falgun Krishna Ekadashi (फागुन) (Feb 15, 2015)
Aamlaki Ekadashi ( आमलकी एकादशी) in Falgun Shukla Ekadashi (फागुन) (March 1, 2015)
Paapmochini (पापमोचिनी एकादशी) in Chaitra Krishna Ekadashi (चैत्र) (Mar 16, 2015)
Kamada Ekadashi (कामदा एकादशी) in Chaitra Shukla Ekadashi (चैत्र) ( March 31, 2015)
Baruthini Ekadashi (वरूथिनी एकादशी) in Baishakh Krishna Ekadashi (वैशाख 2, 2072) (Apr 15, 2015)
Mohini Ekadashi (मोहिनी एकादशी) in Baishakh Shukla Ekadashi (वैशाख 16, 2072) (April 29, 2015)
Apara Ekadashi (अपरा एकादशी) in Jestha Krishna Ekadashi (वैशाख 31, 2072) (May 14, 2015)
Nirjala Ekadashi (निर्जला एकादशी) in Jestha Shukla Ekadashi (जेठ 15, 2072) ( May 29, 2015)
Yogini Ekadashi (योगिनी एकादशी) in Yogini Krishna Ekadashi (जेठ 29, 2072) (June 12, 2015)
** Padmini Ekasadhi (पद्मिनी एकादशी) (June 28 2015)
** Parma Ekasadhi (परमा एकादशी) (July 12, 2015)
NOTE : ** Malamaas (मलमास) occurs once in every three years.
Thuli Ekadashi & Tulsi Bibaha -----------------------------
Among 24 Ekadashis throughout the year of the Hindu Calender, Harishayani Ekadashi (हरिशयनी एकादशी) and Haribodhini Ekadashi (हरिबोधिनी एकादशी) have special significance in Nepal, and are called the Thuli Ekadeshi (ठुली एकादशी / the Greater Ekadashis).
The day of Ashad Shukla Ekadashi (usually falls in June/July) is celebrated as Harishayani Ekadashi. On this day the seedlings are transplanted to pots or lands being accompanied by religious rites. Traditionally, it is done by men. And for following four months the plant is worshiped with special prayers, arati (lamps) and other rituals.
There is a mythology that in those four months, Lord Vishnu had reclined in front of demon king Bali’s palace upon the his request and on the day of Haribodhani Ekadashi he awoke and left for paradise.
After four months the day of Kartik Krishna Ekadashi is celebrated as Haribodhini Ekadashi or Lord Vishnu’s awakening day. People in Nepal throng different temples of lord Narayan (Vishnu), Bagmati River and other holy rivers to take a dip and observed the festival by fasting.
This day is also celebrated as Tulsi Bibaha (तुलसी बिबाह) . Tulasi (basil plant) is considered as an incarnation of Lord Vishnu. On this day Tulsi is married to the Shaligram (a fossil found in the Kali Gandaki river). Three days later, devotees offer one thousand basil's leaves to a sacred river or water.