Ways of celebrating Navarātrī is discussed in this link, which was published on October 04, 2013.
This year Navarātrī commences on September 25, 2014 and ends on October 02, 2014. Actually there are only eight days instead of usual nine days due to tithi differences (lunar day).

SOMEWAYS TO CELEBRATE NAVARATRI

Sri Chakra Navavarana Puja