Hello,
You can find the main template under wp-content/plugins/the-events-calendar/src/views/default-template.php. This is the default template for all views (including single-event.php) if you have “Default Events Template” selected in Events > Settings > Events template.
For the list, day, and month views, you can find the templates for those in their respective folders under wp-content/plugins/the-events-calendar/src/views, and then the content.php file is what you would want to copy and edit for each view you want the link to appear on. For Pro views (week, map, and photo), you can find the templates in wp-content/plugins/events-calendar-pro/src/views/pro.
So, you’ll want to follow the instructions in our themer’s guide to copy the templates into your child theme, where you can then add in your link.
If you have any questions, please let me know!
Thanks,
Jennifer