Please add here any workshop you like.
2013:
January 7 - March 15, 2013 Joint Universities Accelerator School
February 24 - 28, 2013 German-Egyptian School of Particle Physics (application deadline: January 31)
March 11 - 15, 2013 Computer Algebra and Particle Physics (registration deadline: March 6)
March 18 - 22, 2013 Introductory Statistics School (registration deadline: March 1)
April 29 - May 8, 2013 Cargese School 2013 - Cosmic Accelerators (application deadline extended: January 18)
April 24 - May 4, 2013 CERN Accelerator School: Superconductivity for Accelerators (application deadline: over)
May 21 - 25, 2013 Sarajevo School of High Energy Physics (application deadline: March 24)
June 3 - 7, 2013 The First thematic CERN School of Computing (application deadline: February 1)
June 5 - 18, 2013 European School of High-Energy Physics (application deadline: February 15)
June 22 - 29, 2013 Warsaw School of Statistical Physics (application deadline: March 31)
July 7 - 17, 2013 CTEQ School on QCD and Electroweak Phenomenology (application deadline: March 30)
August 5 - 9(?), 2013 Monte Carlo School
August 18 - 29, 2013 CERN Accelerator School (application deadline: May 10)
August 19 - 30, 2013 CERN School of Computing (application deadline: ?)
August 25 - September 4, 2013 Belgian Dutch German school in particle physics (registration deadline: July 4)
August 28 - September 6, 2013 CERN-Fermilab Hadron Collider Physics Summer School (application deadline: April 15)
August 31 - September 11, 2013 Corfu Summer Institute
September 3 - 13, 2013 Herbstschule für Hochenergiephysik
September 16 - 24, 2013 International School of Nuclear Physics (application deadline: July 15)
2012:
January 9 - March 16, 2012 Joint Universities Accelerator School
June 6 - 19, 2012 European School of High-Energy Physics (application deadline: February 24)
July 5 - 12, 2012 International Scientific Baikal Summer School on Physics of Elementary Particles and Astrophysics
July 11 - 18, 2012 Trans-European School of High Energy Physics
July 15 - 21, 2012 LatinoAmerican Workshop on High Energy Physics
July 25 - August 3, 2012 International Summer School on Astroparticle Physics (application deadline: June 1, "early registration" until April 1)
July 30 - August 9, 2012 CTEQ Summer Workshop & Conference on QCD Analysis and Phenomenology (final application deadline: May 7)
August 6 -17, 2012 Hadron Collider Physics Summer School (application deadline: March 25)
August 13 - 24, 2012 CERN School of Computing (application deadline: May 1)
August 19 - 25, 2012 PSI Zuoz Summerschool
August 19 - September 1, 2012 Scottish Universities Summer School in Physics (application deadline: April 30)
August 20 - September 1, 2012 International School Cargese 2012 (application deadline: March 9)
September 4 - 14, 2012 Herbstschule für Hochenergiephysik
September 8 - 26, 2012 Corfu Summer Institute
September 16 - 24, 2012 International School of Nuclear Physics (application deadline: July 15)
September 21 - October 2, 2012 Belgian Dutch German school in particle physics (registration deadline: August 24)
October 14 - 27, 2012 2012 Asia-Europe-Pacific school of high energy physics (application deadline: April 23)
October 28 - November 9, 2012 CERN Accelerator School (application deadline: June 15)
2010:
February 13-20, 2010: ITEP Winterschool;
July 19-30,2010: Cargese Summer School 2010: Physics at TeV Colliders - From Tevatron to LHC
August 1-7, 2010: Zuoz Summer School;
August 16-27, 2010: Fifth CERN-Fermilab Hadron Collider Physics Summer School
General HEP page to start with:
http://www.conference-service.com/conferences/high-energy-physics-and-accelerators.html
CERN page to start with:
http://cdsweb.cern.ch/events/events.py/