On November 17 and 18, 2011, EHESP is co-organizing a national symposium at the Champs Libres in Rennes, on “Festivals-public space: the importance of social ties to prevent the risk of delinquency and addiction.” Olivier Grimaud, EHESP professor and president of the ANPAA Brittany (National Association for the Prevention of Alcoholism and Addiction) will close the symposium.