Because of the growing number of people infected by a coronavirus and the borders closures we were forced to cancel the 2020 conference for the twice time. Despite this situation, we have decided to publish a proceedings instead. We were delighted that
the authors of the published articles, despite the
uncertainty, fears and heavy workload, took up the
proposed topics. Thanks to their efforts, it was posssible to compile a conference anthology for a conference that couldn't be held.