How to filter a View by Date Range (start, end)?
Surprisingly this is not possible with Drupal 8 yet. But there is a long history of trying to make it work: https://www.drupal.org/node/2786577
The last patch, you find in this post, seems to work. You can download and apply it, using the following commands:

wget https://www.drupal.org/files/issues/improve_the_views-2786577-76-core.patch
git apply improve_the_views-2786577-76-core.patch


If git isn't available on your server, try:

patch -p1 &lt; improve_the_views-2786577-76-core.patch


TO apply the patches you have to navigate to the core folder first. And be aware that you have to reapply this patch, after committing a core update. (This sucks!) So let us hope, the Drupal Gods will get this into core soon!