I tried adding the plugin and activating it. I have no problem uploading the CSV same as before and the importer runs but still no dice I get this every time
https://gyazo.com/31034a9dca862b5acea631cd7f8ede59
So what I have done is create a fresh install of WordPress, event calendar and now the real mime check on my local machine
I have no events: https://gyazo.com/b78cfb7fb46cd6a29028c97a9ed6ea76
I run the importer and get that notification and still have no events. I have tried two versions of PHP and debugging mode. I am going to begin to remove things from my CSV starting with the HTML description but from my understanding the Description can be HTML.