Arithmetic Dynamics and Modular Forms - Research Experiences for Undergraduates (REU). University of Wisconsin, Madison, WI, USA; 5 June -- 28 July 2006.
Iwasawa 2006 - Dedicated to Thong Nguyen Quang Do on the occasion of his sixtieth birthday. Limoges, France; 3--7 July 2006.
Number Theory and Cryptography - Open Problems - Workshop in the research session on Securing Cyberspace. Institute for Pure and Applied Mathematics (IPAM) Los Angeles, CA, USA; 9--13 October 2006.
Summer School on Arithmetic Geometry - Clay Mathematics Institute 2006 Summer School. Georg-August-Universität, Göttingen, Germany; 17 July -- 11 August.