WICSA2012 was held in Helsinki, Finland.
WICSA 2011 was held in Boulder, Colorado, USA.
Please visit The Working IEEE/IFIP Conference on Software Architecture at http://www.softwarearchitectureportal.org/WICSA/ for extensive listing of pass conferences.
More information related to WICSA conference series can be found form the portal of the IFIP Working Group 2.10 Software Architecture
Software architecture wiki