'Instructor' is not a term normally used in Learning & Development and as this only allows you to choose from an internal database, it is no good for external providers which most of our events are - so you're left with 'no instructor' in the event details
I propose that this label is changed to 'Event Organiser', and it functions for internal purposes for the L&D organiser's contact details for queries of registered users. This would ideally auto populate with their email (click to contact) and phone from their profile in Workspace