You certainly can assign instructors directly to a specific event, but you need an addiitonal occurrence of Instructors linked directly to Events to do that:
Instructors|Assigned::pkInstructorID = Events::fkAssignedInstructerID
Wow. I have completely underestimated the power of table occurrences. I have created some but have not linked them to my existing routes in the database design to do "no harm". Thus, I had to add layouts as I could not incorporate these unrelated TOs to existing layouts. Thanks Phil for clearing this up for me.