The only way to do this in the system is by adding them as a system user. You can then limit their subadmin permissions to only access the events they are coordinator for. 

Hello! You are correct that we don't have this from the My Schedule option. However we currently have calendar feeds that can be created from the Admin side. You can create a single feed or multiple feeds for instructors. 

Hi there! I know it's been a little bit since you wrote this post, but our team has reviewed this and I wanted to make sure you were aware of current function where you can already do this. But we do have some work to do to make this more clear on the user side. 

In an event's setup page, when an event has a full price component there is an option below the pricing table to turn off full price registration when there are X days remaining in the event (class, lesson, program). 
Example: My event has 5 dates, but i don't want players to register after the 2nd date. I would enter 3 in the box to turn off registration when there were 3 dates left. See my image at the bottom. 

Where we need to improve this is on the member portal side. Currently we are not displaying a "Closed" status on the event like we do when registration has turned off x time prior to the start. The status should update to "Closed" and the button on the event list should change to "View Details". Then on the Event Details page we should show the "Registration Closed" status. We already hide the "Register" button, so it's just about making sure they understand it's closed.