There are not enough details that will show when Ganesh Chaturthi was first celebrated but this is one of the festivals that has always been celebrated in Pune which occurred in 1630. This means that this is a celebration that has been done for a long time and the tradition has been passed on from one generation to another.
This is not very surprising. India is known to be one of the countries with a very rich culture. They take their culture and religious traditions very seriously. People who go to India for the first time usually feel blessed to see their unique culture. This is one of the events that is considered to be big in India.