Good evening Torsten and welcome back!
Thank you for reaching out to us.
I would love to help you with this topic.
You could customize the Submit event view to your liking by doing a template customization.
You might want to read our Themer’s guide to get a sense of how that works.
As an alternative, you could force the display of those fields with CSS.
Try adding the following CSS rule to your style.css file or in your Custom CSS metabox:
.event-community-venue tr.venue {
display: block !important;
}
This will force the display of the fields (you might need additional CSS). But, it makes the interface counter-intuitive when you select an existing venue as the fields will not get populated.
Let me know if that helps.
Have a great day!
Geoff B.