Fellow category theorists, The 86th edition of the Peripatetic Seminar on Sheaves and Logic will be held at the Institut Élie Cartan of the Université Henri Poincaré in Nancy, on the weekend of September 8-9 2007. More details will be announced later this summer, but interested people can start contacting me now. We intend to continue the PSSL tradition of informality, and scheduling talks pertaining to any aspect of category theory, with or without applications in natural science, logic, computer science, or other branches of mathematics. The fast TGV-Est train line will be inaugurated in June, and the Paris-Nancy trip will then take only 1h30m, with easy connections to the two Paris airports. The city of Nancy is right on the Paris- Munich train line, and also has good train connecftions with the north (Luxembourg, Brussels and Frankfurt via Metz) and the south (Lyon, Nice...). There is a local airport, 45 minutes away from downtown by minibus shuttle, and there are also two relatively close international airports, Luxembourg and Strasbourg, which often allow you to do the airport-dowtown Nancy trip in less than 2h30m. Nancy is of considerable interest for the mathematical tourist, being the birthplace of Henri Poincaré, and being intimately related to the career of Nicolas Bourbaki. It has two historical old towns: the medieval one, with the Renaissance palace of the Dukes of Lorraine, and the classical one, with UNESCO World heritage sites built by Duke Stanislas. It is can also boast one of the highest concentrations of Art Nouveau architecture in all of Europe, rivalling Prague and Barcelona. Hoping to see you in September, François Lamarche http://www.loria.fr/~lamarche