- Münster, Germany (2022)
- Padang, Indonesia (2018)
- Cologne. Germany (2015)
- Zurich/Winterthur. Switzerland (2014)
- San José, Costa Rica (2014)
- Amsterdam. The Netherlands (2013)
- Münster, Germany (2012)
- St. Petersburg, Russia (2011)
- Pachuca, Mexico (2010)
- Münster, Germany (2008)
- Aix en Provence, France (2008)
- Beijing, China (2007)
- Tokio, Japan (2005)
- Pretoria, South Africa (2005)
- Brüssel, Belgien (2004)
- Münster, Germany (2004)
- Adelaide, Australia (2003)