Alfred Tarski Centenary Conference
Stefan Banach International Mathematical Center, Warsaw, Poland; 28 May -- 1 June 2001.
http://www.mimuw.edu.pl/TARSKI/
Foundation of the Formal Sciences IV
The History of the Concept of the Formal Sciences. Rheinische Friedrich-Wilhelms-Universität Bonn, Germany; 14--17 February 2003.
http://www.math.uni-bonn.de/people/fotfs/IV/
Midwest Philosophy of Mathematics Workshop
An annual conference. Last meeting: University of Notre Dame, Indiana, USA; 11-12 November 2006.
http://philosophy.nd.edu/news/events/philosophy-math-conference/index.shtml
PMP2002
Perspectives on Mathematical Practices, an International Conference on the Philosophy of Mathematics. Brussels University (VUB), Belgium; 24--26 October 2002.
http://www.vub.ac.be/CLWF/PMP2002/
20th WCP: Philosophy of Mathematics
Papers given at the Twentieth World Congress of Philosophy; Boston, Massachusetts, USA; 10--15 August 1998.
http://www.bu.edu/wcp/MainMath.htm