The most important festival in Mumbai is Ganesh Chaturthi, in honour of Lord Ganesh. Celebrated in the month of August/September, it is the birthday of Ganesh - the elephant headed son of Shiva and Parvathi. Ganesh is believed to remove all obstacles to success and bring good luck and prosperity and keeps natural calamities at bay in the lives of those who worship him. This ten day festival begins with the installation of the deity, who is then worshipped daily till the immersion on the final day. Small Ganesh idols are installed in homes. Some idols tower up to 10m high and weigh several tonnes. On the tenth day, processions fill the streets and with the accompaniment of drumbeats and music, the image of Ganesh is immersed in the water. Devotees chant 'Ganapati Bappa Morya' which means Ganesh, Daddy, please come back soon next year.