Verhalen en herinneringen, 2015, Wittem monastery gardens, Wittem, The Netherlands
The Slow Flow Show, 2010, Greenbench Gallery, Whanganui, Aotearoa | New Zealand
Arcade Art, Carlisle Arts Festival, 2009, installations / workshops + performances, Carlisle, U.K.
The Tree Top Gallery, 2009, installations / workshops and performances in trees in Regents Park, London, U.K.
Van Tulp tot Istanbul, 2006, Seven artists based in the Netherlands. Curated by Marion Wagenvoort.

"Far Near Neighbours" Sarajevo Winter Festival XX, Bosnia-Herzegovina, 2005, installations and performances by 14 artists. Curated by Park Byoung-Uk.

Off The Wall, 2004, installations, performances, and workshop projects in the Templar's Shopping Centre, Oxford, U.K.
Curated by Helen Edwards and Helen Pearson.

Sonja's 1992 graduation exhibition,1992, installation of prints and sculptural objects in a room and hallway in the
Maastricht Academy of Fine Arts (Stadsacademie Maastricht), Maastricht, The Netherlands.