Hi,
Thanks for using our plugins.
To edit the event templates you want to follow our themer’s guide:
https://theeventscalendar.com/knowledgebase/themers-guide/
Then look to edit the single event templates found in the core version of the plugin and not in pro.
You will want to look in this directory to start:
wp-content\plugins\the-events-calendar\src\views\single-event.php
Then look in the modules directory to edit those templates as well.
Let me know if you have any follow up questions.
Thanks