Hi,
Thanks for the interest in our plugins.
You do not need to Pro for WooCommerce Tickets to Work.
You only need the core version of the Events Calendar found for free on WordPress.org: https://wordpress.org/plugins/the-events-calendar/
However, Tickets are created in Events so you have to have them attached to events to work.
Each event does require and end date as well.
You could set the event to all day and then set a date far in the future for the end date. So you could sell tickets for a range of days that way.
You can see more of the WooCommerce Ticket Features Here:
https://theeventscalendar.com/knowledgebase/new-user-primer-woocommerce-tickets/
Let me know if you have any follow up questions.
Thanks