SageDays

Sage Days 2, Oct. 6 - 10, 2006 (Univ. of Washington)
  General workshop
Sage Days 3, Februrary 17-21, 2007 (UCLA, sponsored by IPAM and NSF)
  General workshop
Sage Days 4, June 12-17, 2007 (Univ. of Washington, sponsored by NSF UW/VIGRE a$
  Software Development
Sage Days 5, Sept 30 -- Oct 3, 2007 (Clay Math Institute, fully funded)  
  Computational Arithmetic Geometry
Sage Days 6, November 10-14, 2007 (Bristol, UK at the Heilbronn Institute)
  Cryptography and Computational Number Theory