Creating Single Page Template
Edit directly file stachethemes_event_calendar\front\view\single.php
In your theme folder create file single-stec_event.php file. This will completely override the default "stachethemes_event_calendar\front\view\single.php" file.
This method will not load the default js and css files. If you need them you can check how to include them from file stachethemes_event_calendar\inc\inc.posts-templates.php line 33 to 72