Hello Alex! Thanks for getting in touch and welcome to the forums! We hope you’ve been enjoying the PRO plugin so far. 🙂
Good question. Adding required fields to the event editor isn’t currently supported out of the box. However, I imagine you could achieve that using jQuery to select the fields and insert HTML5 required tags on them.
Sorry I don’t have more of a concrete solution for you here, but I hope this at least helps you get started in the right direction. 🙂
Cheers!
Geoff