cast the circle call the corners . invoke Lilith. ( try to have a symbol of Lilith on your altar)  Say " summer has come to the end. the next cycle of darkness is  upon Us" Mediate upon Lilith try to have an apple or other fruit  on the altar. Then say " behold the produce of the earth''. Then say '' Oh dark mother Goddess Lilith , summer has ended, the days are growing shorter. The cool air returns . the leaves are changing color  even snow will cover the ground soon darkness reigns." mediate some more  on Lilith. " then say darkness begins its reign  behold the dark mother my Goddess my queen oh lilith i honor thee"  do divination or magick  if you like move onto cakes and ale.