Hi, is there any law that forces you to order medical services at events?

Hi, of course there is, because the lives of the people who are there depend on it https://www.valhallamedics.com/get-professional-event-medical-services/. If you want your event to go smoothly and not expect any trouble, then you must provide security and medical services appropriate to the risk level and requirements of the event. If you fail to do so and get into a minor accident, you may have to pay a substantial fine, not to mention imprisonment.