Good evening Amanda and welcome back!
Thank you for reaching out to us.
I would love to help you with this topic.
Normally, unchecking all the checkboxes found at the bottom of the page under Events -> Settings -> Tickets should do the trick.
You could apply the following snippet in the functions.php file of your theme (without the PHP tag at the top): https://gist.github.com/jesseeproductions/9ff8863230e5a05b9303#file-tribe-tickets-plus-prevent-emails-php
But first to be extra safe, before making any changes to your functions.php file, you should make a backup of that file.
Let me know if that helps.
Have a great day!
Geoff B.