As per Hindu calendar, Bhadrapada month's fortnight is celebrated as the birthday of Lord Ganpati. This year, the Chaturthi is beginning on September 9 and will go up to September 18, that is Anant Chaturdashi.
The Ganpati festival is celebrated in India with much fun and fair, people worship Ganesh ji and fast to please the God in various ways mentioned in the Shastras.