Dear Colleagues, We are glad to let you know that the registration for the "Workshop on Category Theory" in honour of George Janelidze, to be held from Monday 9th July to Friday 13th July 2012 at the University of Coimbra, is now open at the conference websitehttp://www.mat.uc.pt/~workCT/ The deadline for registration is April 30. On the website you will find a list of hotels in Coimbra, and some information concerning the conference. Contributions in all aspects of Category Theory are welcome, and in particular in the areas to which George Janelidze has contributed. If you wish to give a talk, please send us your abstract before May 31. Please use the .tex file available on the website of the conference to prepare the abstract. We are looking forward to seeing you in Coimbra! The Organizers Maria Manuel Clementino Marino Gran Jorge Picado Manuela Sobral Lurdes Sousa [For admin and other information see: http://www.mta.ca/~cat-dist/ ]