Hi,
Thanks for using the Events Calendar.
Here on the pre-sales forum, I’m afraid we do not provide technical support. I would ask that you take any technical support questions across to our wordpress.org forum – our staff scan it periodically and other community members may also be able to help out.
The Events Calendar
If you have purchased a plugin from us, please login and post in the premium forums for that plugin and we can help you out there:
https://theeventscalendar.com/support/forums/
Having said that this is the single event template:
plugins/the-events-calendar/src/views/single-event.php
And most of the details are in this directory:
plugins/the-events-calendar/src/views/modules
For further questions please post in the support forum on WordPress.org
Thanks again!