Ganesh Chaturthi (Chauth) is the day for worshipping Ganpati Maharaj. In the Holy Shikshapatri, Bhagwan Swaminarayan urges His Acharyas to worship Ganpati Maharaj on this day (Bhadarva Sud Chauth)

The leela behind the vrat is that on this day, Ganeshji was on his way to Kailash and Chandradev (Moon God) started making fun of Ganeshji. At first Ganeshji tried to ignore Chandradev, but eventually he became very angry and cursed Chandradev that no one would look at the beautiful moon on this day and that those that do would be cursed with misfortune

The leela behind the vrat is that on this day, Ganeshji was on his way to Kailash and Chandradev (Moon God) started making fun of Ganeshji. At first Ganeshji tried to ignore Chandradev, but eventually he became very angry and cursed Chandradev that no one would look at the beautiful moon on this day and that those that do would be cursed with misfortune

The leela behind the vrat is that on this day, Ganeshji was on his way to Kailash and Chandradev (Moon God) started making fun of Ganeshji. At first Ganeshji tried to ignore Chandradev, but eventually he became very angry and cursed Chandradev that no one would look at the beautiful moon on this day and that those that do would be cursed with misfortune

In addition to lifting the curse Ganeshji declared that those who worshipped him on this day in this way would find happiness and good fortune.

Hence people now worship Ganeshji on this day