Bhishma Ekadashi is the day when Bhishma attains salvation , it is majorly celebrated in Southern India. In 20202 the day falls on 5th of Februrary.
Shuklapaksha Ekadashi is the great Mahaparvam in the Maghamasam. On this day recitation of the Sri Vishnu Sahasranama and fasting give great fruits in life. This ekadashi is also known as 'Bhishma Ekadashi'.
In the Mahabharata, Bhishma (Sanskrit: भीष्म) (also known as Bhishmacharya) was well known for his pledge of Celibacy. He was the eighth son of Kuru King Shantanu and the river goddess Ganga. Bhishma was blessed with wish-long life and was related to both the Pandava and the Kaurava.
Bhishma, the eighth-born from the womb of Ganga, When she was going to dispose of her in the Ganges, her husband, Shantana Maharaj stopped her. So she handed the boy over to him and she left.
Bhishma gained the wealth of knowledge, and every word he preached, is closely related to the truth.
After the war for eleven days in the Mahabharata was over, the Pandavas come to Krishna's post-war battle to see Bhishmu, who was wounded and lying on the arrow bed. When Srikrishna and Pandavas approached Bhishma he shared his wisdom with the kings, which was later called the Bhishma Niti