Currently, event editors can be Confluence users or Confluence groups. In some use cases, it might make sense to allow entering spaces as well (e.g. when using a combination of spaces as visibility restriction, if there is no Confluence group with exactly those members).

It might be expected that only users with edit permissions in the given spaces would be able to edit the event, causing potential confusion/inconsistency because entering the same input as for event visibility might not give the same results (visible to everyone in these spaces, editable only for space editors).

If allowing spaces as input for event editor permissions would help you, feel free to comment which version you think fits your situation better!