Hi Niels,
Thanks for your interest in our plugins!
Much as we’d love to have you as a customer, I don’t think Events Calendar PRO is going to help with your specific needs.
Our free, core events plugin (The Events Calendar) however could be a good base for you to build upon and if you combined this with a good ecommerce plugin you’d certainly be getting a bunch of powerful functionality ‘for free’.
There is certainly going to be quite a lot of customization work involved here even so and assessing exactly how much or how that should look goes a little beyond the level of advice we can provide you with here.
That said, if you have any other specific questions about the functionality of any of our plugins please don’t hesitate to let me know 🙂