The conference has been rescheduled from May 2020 to October 2021. However, some delegates needed a publication before October 2021, for example to graduate for their PhD. So we have made a first volume of the Proceedings for those authors. Those papers have been blind peer-reviewed and assessed by the program committee (many thanks to all the reviewers!) following our usual procedure. The papers from this first volume will still be presented at the conference in 2021.