IRIS SMOOT/Acorn Newspapers AUDIENCE PARTICIPATION- Members of the Westlake High School "Class Act" choir sing to audience member Dominic De Bois, 5, at the Hospice of the Conejo Community Tree Lighting Celebration on Sunday evening at Gardens of the World in Thousand Oaks. For a $15 donation to the hospice, community members can hang a star in memory of a loved one on either of two special trees at Gardens of the World or The Oaks mall. The celebration included carols performed by the Merrywoode Carolers and harp music by Michelle Tormey and Diane Phillips.