CatMAT 2000 - Categorical Methods in Algebra and Topology - Commemorating 25 years of Category Theory in Bremen. University of Bremen, Germany; 21--25 August 2000. CT99 - University of Coimbra, Portugal; 19--24 July 1999. School on Category Theory and Applications - University of Coimbra, Portugal; 13--17 July 1999. CT95 - Canadian Mathematical Society Annual Seminar. Dalhousie University, Halifax, Canada; 9--15 July 1995. CTCS'99 - 8th conference on Category Theory and Computer Science. Edinburgh, Scotland, UK; 10--12 September 1999. Applications of Category Theory to Computer Science - Mount Allison University, Sackville, NB, Canada; 8--12 June 1998. Category Theory OctoberFest - McGill University, Montreal, Canada; 16--17 October 1999. Categorical Structures for Descent and Galois Theory, Hopf Algebras and Semiabelian Categories - Workshop, Fields Institute, Toronto, Canada; 23--28 September 2002.