The Ekadashi that concurs with the Shukla Paksha (waxing phase of the Moon) of the Adhik/ Purushottam Maas/ Mala Maas which is the leap month in the Hindu calendar is called Padmini Ekadashi.
This Ekadashi Vrat is observed only during the year when the Adhik Maas is incorporated. However, this Ekadashi Vrat is of great significance.
Moreover, this Ekadashi has occurred during the Chaturmas period, which doubles its importance. The Padmini Ekadashi of 2020 will be observed on September 27.