Applications of Category Theory to Computer Science: Mount Allison University, Sackville, NB, Canada; 8--12 June 1998.
Categorical Structures for Descent and Galois Theory, Hopf Algebras and Semiabelian Categories: Workshop, Fields Institute, Toronto, Canada; 23--28 September 2002.
Category Theory OctoberFest: McGill University, Montreal, Canada; 16--17 October 1999.
CatMAT 2000: Categorical Methods in Algebra and Topology - Commemorating 25 years of Category Theory in Bremen. University of Bremen, Germany; 21--25 August 2000.
CT2000: Villa Olmo, Como, Italy; 16--22 July 2000.
CT95: Canadian Mathematical Society Annual Seminar. Dalhousie University, Halifax, Canada; 9--15 July 1995.
CT99: University of Coimbra, Portugal; 19--24 July 1999.
CTCS'97: 7th conference on Category Theory and Computer Science. S. Margherita Ligure, Italy; 4--6 September 1997.
CTCS'99: 8th conference on Category Theory and Computer Science. Edinburgh, Scotland, UK; 10--12 September 1999.
Derived Categories and Applications: ICMS, Edinburgh, Scotland, UK; 2--7 June 2003.
School on Category Theory and Applications: University of Coimbra, Portugal; 13--17 July 1999.