 Zimmerman and the Clergy Letter Project also organize "Evolution Weekend," an annual movement to encourages churches to discuss the role of science and religion in sermons, discussion groups, seminars, and other activities on the weekend nearest to February 12, the birthday of Charles Darwin (Darwin Day).The day began in 2006 as "Evolution Sunday," gaining attention from "The New York Times".In 2008, it was renamed "Evolution Weekend" to incorporate more faith traditions.