Share calendar without possibility to edit

would like to share a calendar with multiple users. However, the appointments of other users should be able to be entered in this calendar, but other appointments of other users should not be edited or deleted. How do I achieve this?

Nextcloud version: 26.0.0
Operating system and version: Linux 5.4.0-155-generic x86_64
PHP version: 8.1.21

You can share a calendar in read-only mode by clicking a checkbox when performing the share.

Yes, but than someone who share this calendar can’t do a new entry to this calendar.
If I don’t share this calendar in read-only mode he can do own entrys an edit them, but he can also edit entrys of other users, but this is not wanted.

Ah, yes. This is not possible to distinguish indeed.