Adding Teacher Bio to Events
You're not going to be able to inject a WordPress page/post into a CiviCRM event without some custom code.

If your event pages are dropped into WordPress pages/posts via a shortcode, you could add the bios above or below the shortcode.  This is the simplest approach, and if you wanted to reposition the bios to be within the "Description", that would be doable with 3-4 lines of jQuery.