Ekadashi occurs on the 11th day of each period (twice a month). Ekadashi means 11 (Ek meaning 1 and dash meaning 10, therefore 11). It is tradition in Hindu religion to observe fast on this day and is considered a holy day.
There are 24 Ekadashis in a year (sometimes 26 in a leap year). Each Ekadashi has its own name and specific significance. Devotees observe a fast, abstaining from grains and beans, and spend the day in prayer, scripture reading, and devotional activities.
Lord Swaminarayan has placed great importance on observing Ekadashi. In the Shikshapatri, He instructs His followers to observe Ekadashi fasts. Devotees who observe Ekadashi are believed to attain spiritual merit and purification of the mind and soul.
Key Ekadashis in the Swaminarayan calendar include Devshayani Ekadashi (the start of Chaturmaas), Prabodhini Ekadashi (the end of Chaturmaas), and Nirjala Ekadashi (the most austere, observed without even water).