Hi Eric!
Thanks for reaching out to us! Let me help you with this topic.
Events Calendar PRO does not provide the feature you mention. However, if you choose to sell tickets for your events using Event Tickets Plus and WooCommerce as the E-Commerce platform, you will be able to use the coupons feature built-in with WooCommerce, so users can apply coupons for their ticket purchases.
Does it help? Let me know if you have other questions and I’d be happy to help as much possible.
Best,
Victor