Hi there Giammarco,
Thanks for reaching out and for your interest in our products 🙂
Regarding compatibility with ACF I’m not aware of any major conflict with said plugin and ours. That being said we cannot assure continues compatibility between the plugins but it’s something we look forward to since they product is great and widely used!
Events Calendar PRO comes packed with additional fields that will be shown in the front end of the site without any additional coding (as it would require to show ACF). PRO additional fields are also filterable by Filter Bar (a separate add-on that generates filter options for your calendar), while with ACF you’ll need to code the filters your self.
Please let me know if there’s anything else I can do for you,
Best,
Nico