Navratri means the nine nights. In the nine nights you turn inwards. It is a time for meditation, for you turn inwards, and then come out with creativity. That is the significance. Chaitra means the beginning of a New Year. So the New Year beings with nine days of turning inwards; prayer, meditation, and chanting. Recognizing the Divinity in the whole creation, and enlivening that aspect.
The practice of silence has been known throughout the ages, in many different traditions and cultures, as a great tool for elevating consciousness. When profound meditations are added to this silence we find that our ever-changing thoughts come to a rest and our mind becomes clear giving rise to intense joy from within.