Conference will gather "doers" with leading researchers, city officials and NGO heads to exchange the latest research at a critical moment for cities; Early Bird registration and Student Call for Abstracts ends Saturday, Aug. 31stABOVE: Partial listing of the rich roster of speakers scheduled for the 61st International Making Cities Livable (IMCL) conference, on "The Ecology of Place: Learning from Nature, Culture and History." (More speakers will be announced.) CORTONA, ITALY - Partners and pa