Ever year in India they celebrate Lord Ganesha with a festival, and the symbolic floating statues of him in the river, known as Ganesha Visarjan.
There are many stories about Ganesha (also know as Ganapati) and how he came to have the elephant head. According to Wikipedia devotion to Ganesha is widely diffused and extends to Jains, Buddhists, and beyond India.
He is widely revered as the remover of obstacles, the patron of arts and sciences and the deva of intellect and wisdom. As the god of beginnings, he is honored at the start of rituals and ceremonies, and also invoked as patron of letters and learning during writing sessions.
Although he inherited traits from Vedic and pre-Vedic precursors, he emerged during the Gupta Period in the 4th and 5th centuries. There is a sect of devotees called the known as the Ganapatya that reveres him as the supreme deity, with the principal scriptures dedicated to Ganesha the Ganesha Purana, the Mudgala Purana, and the Ganapati Atharvashirsa.