Good evening Evans and welcome to the Events Calendar forum!
Thank you for your interest in our products.
We’ll be glad to answer your questions.
Do you need to purchase a license for the events calendar and the events tickets to have a calendar that people can purchase tickets?
The short answer is yes.
You need to get a copy of our Event Tickets Plus add-on: https://theeventscalendar.com/product/wordpress-event-tickets-plus/
This extends our Event Tickets plugin and brings many new features including the ability to use WooCommerce to sell tickets.
Let me know if that helps.
Have a great day!
Geoff B.