- OSS 2014: May 6-9 2014, San Jose, Costa Rica
- OSS 2013: June 25-28 2013, Koper/Capodistria, Slovenia
- OSS 2012: September 10-13 2012, Hammamet, Tunisia
- OSS 2011: September 19-24 2011, Salvador, BA, Brazil
- OSS 2010: May 30 – June 2 2010, Notre Dame, IN, USA
- OSS 2009: June 3-6 2009, Skovde, Sweden
- OSS 2008: September 7-10 2008, Milan, Italy
- OSS 2007: June 11-14 2007, Limerick, Ireland
- OSS 2006: June 8-10 2006, Como, Italy
- OSS 2005: July 11-15, 2005, Genoa, Italy
