I am opening this topic as there is still no definitive solution to add a featured image to a single events page.
My sample page is http://unievents.simplecsr.com/events/2014/08/sample-live-event-2/ and it uses a copy of the single-incsub_event.php file in my theme (to protect changes)
I would like to add the featured image to display next to the title (which i will do with CSS.)
I would like to call it from the copy of single-incsub_event.php i have so all changes are protexted from future updates. I would also need to give it a unique Div class to float and size it accordingly.
(All other threads I have found suggest various solutions for showing the featured image on the archive pages. I also need to do this but would first like to fix the single event view.)