You need to copy single.php file with the name of eventer.php and place it in theme folder.
After that you can use pre built shortcodes of Eventer plugin to use in visual composer.
Below are the shortcodes which can be used with page builder.
How come there isn’t a short code for the event description/content? I’ve been trying to figure this out while creating a custom template for my single events pages. I tried the_content like I found in another ticket, but no luck.