The Interstellar Medium in Three Dimensions with Gaia GREAT-ESF Workshop, 11 - 14 July 2011, The Lorentz Centre, Leiden University, Leiden, The Netherlands (workshop website)
The UVES Analysis of the Gaia-ESO Survey: tests, tools, and survey implementation GREAT-ESF Workshop, 26 - 27 Sep 2011, ESO, Garching, Germany (workshop website)
Orbiting couples: "pas de deux" in the Solar System and the Milky Way GREAT-ESF Workshop , 10 - 12 October 2011, Paris Observatory, Paris, France (workshop website)
Workshop Gaia and the End States of Stellar Evolution GREAT-ESF Workshop, 11 - 14 April 2011, The University of Leicester, UK (workshop website)
The Fundamental Cosmic Distance Scale: State of the Art and the Gaia Perspective. GREAT-ESF Conference, 3 – 6 May 2011, Osservatorio Astronomico di Capodimonte, Naples, Italy ( meeting webpage
Solar System science before and after Gaia GREAT-ESF Workshop. 4 – 6 May 2011, Pisa, Italy. ( meeting website)
Stellar Clusters & Associations . 23 – 27 May 2011. IAA-CSIC. Granada, Spain, ( meeting website)
Astrostatistics and Data Mining in massive astronomical databases. GREAT-ESF Joint Workshop and Summer School,. 30 May – 3 June 2011, La Palma, Canary Island, Spain ( meeting webpage, Resumen presentado a la reunión GREAT-Bruselas-Junio2011)
QSO Astrophysics, Fundamental physics, and Astrometric Cosmology in the Gaia era. GREAT-ESF Workshop. 6 - 9 June 2011, Faculty of Sciences, University of Porto, Porto, Portugal ( meeting website)
4th* *GREAT Plenary Meeting , 21 - 23 Jun 2011, Brussels, Belgium (Plenary website)
Stellar Atmospheres in the Gaia Era: Quantitative Spectroscopy and Comparative Spectrum Modelling GREAT-ESF Workshop, 23 - 24 June 2011, Free University Brussels (Vrije Universiteit Brussel - VUB), Campus Etterbeek, Brussels, Belgium (workshop website)
The Great Wiki page lists the full list of relevant science meetings.
The ESA Gaia page also has a calendar of meetings