Hi Manuel. Thanks for considering our plugins.
I’m unclear what you’re trying to accomplish, and our PRO add-on doesn’t include any contact form. In fact, I think the only add-on for The Events Calendar we have that includes front-end interaction from your users would be Community Events, which is for your site visitors to add new events.
Please provide a full example or other information to help me better assist you with your question.
FYI: We have a pretty great Refund Policy so you can buy one or many of our add-ons and thoroughly test them if you prefer to just try them out.