ICMP 2003 (Popularity: )
http://icmp2003.net/ 14th International Congress on Mathematical Physics. University of Lisbon, Portugal; 28 July -- 2 August 2003.
ICTAM 2004 (Popularity: )
http://ictam04.ippt.gov.pl/ XXI International Congress of Theoretical and Applied Mechanics. Warsaw, Poland; 15--21 August 2004. Pre-registration online.