at The Manchester Conference Centre on 29 Aug 2012 – 2 Sep 2012

at Sheraton Gateway Suites O’Hare on 24 May 2011 – 27 May 2011

at Amsterdam RAI on 18 May 2011 – 21 May 2011

at Sheraton Gateway Suites O'Hare Hotel, Rosemont, IL on 18 May 2010 – 21 May 2010