Hey Josh,
Welcome to the forums and thanks for choosing PRO!
We have a great article outlining how to create custom templates, such as listing the # of tickets available next to the ticket title. It’s called the Themer’s Guide. To get you started in the right direction, the specific template you’ll need to override is /events/calendar/pro/src/views/pro/single-event.php.
Let me know if this helps and feel free to follow up with any questions. Thanks again for choosing us for your events calendar needs and enjoy your week!