Hi there Anna,
Thanks for reaching out to us and for you interest in our products 🙂
Events Calendar PRO can be used for multilingual sites powered by WPML plugin. Unfortunately The Events Calendar (or premium add ons like Events Calendar PRO) is still not 100% compatible with Polylang. This doesn’t mean it won’t work at all, but that we cannot support officially.
While we don’t have a trial period, you can go ahead and purchase the products to test them alongside Polylang. If you decide they are not what you are looking for, you can ask for a full refund within 30 days of purchase. For more information take a look at our refund policy.
Please let me know if there’s anything else I can help you with,
Best,
Nico