Event medical cover is a service provided by many companies such as Outdoor Medical Solutions.
If you are hosting any kid os event then you will need to make sure that you have adequate protection for the people coming to the event. There is always the possibility that something can unhappen that is unplanned for even if you have everything in hand. It would be the height of folly to not have some kind of medical care on hand.
The size of the event is the most common factor in deciding the overall level of cover that you will need. Whilst there is always a degree of personal safety that you would expect the general public to have this can certainly not be relied on. The nature of the event and the people that are likely to attend it is also a large consideration. Not to be judgemental but if you are planning to have an event that caters for the younger generation this is more likely to produce incidents as the statistics indicate.
However that is not to say that you should ease back if there are older members of the public in attendance. In fact given the possible health issues that may be already be there either being treated currently, or may suddenly surface, having a dedicated team of outdoor medical staff may well save a life so don’t risk it.