This is a reminder of the conference HOCAT 2008 Homotopy Structures in Geometry and Algebra; Derived Categories, Higher Categories which will be held from June 30 to July 5, 2008, at the Centre de Recerca Matemàtica, Barcelona. This is an event within the CRM thematic year on Homotopy Theory and Higher Categories (http://www.crm.cat/hocat/). The following have agreed to speak at the conference: John Baez (University of California at Riverside) Paul Balmer (University of California at Los Angeles) David Benson (University of Aberdeen) Julia Bergner (Kansas State University) Tom Bridgeland (University of Sheffield) Søren Galatius (Stanford University) Ezra Getzler (Northwestern University) Mikhail Kapranov (Yale University), to be confirmed Ralf Meyer (Georg-August Universität Göttingen), to be confirmed Charles Rezk (University of Illinois at Urbana) Bertrand Toën (Université Paul Sabatier, Toulouse) Michel Van den Bergh (Hasselt University) A limited number of slots are available for contributed talks. Prospective speakers should submit an abstract to any of the organisers before April 30. For registration (deadline May 31) and further information about the conference, see http://www.crm.cat/HOCAT2008/. We look forward to seeing you in Barcelona. The organisers, Carles Casacuberta André Joyal Joachim Kock Amnon Neeman Frank Neumann