Question: why ganesh utsav is celebrated?
Answer: This day is celebrated as the birthday of Lord Ganesh, the elephant-headed son of Lord Shiva and Goddess Parvati. Lord Ganesh is the symbol of wisdom, prosperity and good fortune. ... Ganesh Chaturthi is a 10-day festival; celebrated on the fourth day of the month of Bhadrapada; to mark the birth of Ganesha.