Good evening Anthony and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
I would love to help you with this topic.
This might vary from one WordPress theme to the other, but the file for that functionality is located here: /wp-content/plugins/events-calendar-pro/src/views/pro/related-events.php or in the /tribe-events/ folder of your theme.
I believe that it defaults to events that are close in time to the event currently viewed.
But this can be customized.
You can tweak the following snippet in the functions.php file of your theme (without the PHP tag at the top): https://gist.github.com/GeoffEW/307ee8b9197718f869c57d24b0b5008f
You can read about that here: https://theeventscalendar.com/customizations/
If coding is not really your cup of tea, you could always hire one of our recommended customizers to do the customization for you.
Let me know if that helps.
Have a great day!
Geoff B.