This is the second announcement of the conference HOCAT 2008 Homotopy Structures in Geometry and Algebra; Derived Categories, Higher Categories June 30 to July 5, 2008 Centre de Recerca Matemàtica Bellaterra (Barcelona) 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 March 31 (and will be notified before April 15). For registration (deadline May 30) 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