Ganesha Chaturthi Vrat Katha
Goddess Parvati was taking bath. While bathing, she created an idol made of mud, named it Lord Ganesha and placed it at the entranceway. She breathed in life to the idol and hence, Lord Ganesha was born. She instructed him to act as a guard and not allow anybody inside, unless she has finished bathing. After some time, Lord Shiva, the consort of Goddess Parvati, entered home. He was very thirsty. As he was approaching Goddess Parvati to quench his thirst, he was stopped by Lord Ganesha.
Lord Ganesha didn't allow Lord Shiva to enter the premises, where Goddess Parvati was taking bath. This made Lord Shiva very angry and consequently, he beheaded Lord Ganesha. When Goddess Parvati came to know this, she became intensely angry and grew ferocious and strong enough to destruct the world.
All the Gods from swarglok and Lord Shiva himself requested the highly aggressive Goddess Parvati to calm down. In order to pacify her, Lord Shiva fixed the head of an elephant onto Lord Ganesha's body. Not satisfied with it, Goddess Parvati asked that Lord Ganesha should be worshipped before all the other gods. Since then, Lord Ganesha is invoked first, before worshipping any other deity. This story makes the foundation for the celebration of Ganesh Chaturthi in different parts of India.