on (someone's) behalf
acting as someone's agent, acting for the benefit of someone
I was able to sign for the registered letter on my wife's behalf.
Festivals of India
Ganesha Chaturthi is the birthday of Lord Ganesha, the son of Shiva and Parvati. It is believed that Lord Ganesh bestows his presence on earth for all his devotees during this festival. On this day Shiva declared his son Ganesha as superior to all the gods, barring Vishnu, Lakshmi, Shiva and Parvati. Ganesha is worshipped as the god of wisdom, prosperity and good fortune and traditionally invoked at the beginning of any new venture or at the start of travel. The festival is celebrated in a grand way in state of Maharashtra for 10 long days and ends with grand processions carrying Ganesh idols for immersion into water.