Hey Milan,
Thanks for reaching out to us!
You can customize the forms by adding your own options to the front-end form and then saving them to match existing meta that you may have already set up for the back end view of the events. You would do this by following our Themer’s Guide and adding additional meta to the templates there.
Alternatively, our Pro plugin does have an “Additional Fields” feature that does let you register additional meta information for events that will automatically get added as fields within the Community Events submission form.
Let me know if this helps.
Thanks!