There is library of documents sets. Every document set stands for a specific event, has a bunch of metadata attached and groups all event related documents. There is also a view which shows a flat list of event protocols from all events.
Unfortunately I found no OOTB way to navigate from a protocol file to its parent event document set in SP online modern experience.
I tried to provide a link in a separate column of the protocol list by developing a field customizer. That worked in general but since field customizers are not (yet) supported in the web part view of a list it is of no use for me.
What else can i do?