Ok, so I created a new folder “tribe-events” under my custom theme: /wp-content/themes/OTTAS
I also copied the file /wp-content/plugins/the-events-calendar/src/views/default-template.php to that new folder.
The file I always need to update when Event Calendar updates come out is:
/public_html/wp-content/plugins/the-events-calendar/src/resources/css/tribe-events-theme.min.css
So I copied that file to a new file “tribe-events.css” also under the new “tribe-events” folder.
If I change the Events -> Settings -> Display -> ‘Default stylesheet used for events templates’ to “Skeleton Styles”, will only my custom css: /wp-content/themes/OTTAS/tribe-events/tribe-events.css be loaded?