Release Notes and Event Roster/Account Limitations

As someone playing on 2 different servers(in the same region), i’m always struggling to distinguish if events are limited to 1 per roster or 1 per account/region(?). It would be nice if future release notes would be more specific in regards to this.

e.g. The new events (Feiton Powerpass & Express) are both 1 per account/region(?), however the release notes are too ambiguous to determine this.