Over the years I have worked for a number of outfits specialising in pleasure flying. It is a (financially) risky business even for those with lots of experience.
I have spent many hours listening to views on what makes a good event. Busy, but without anything (else) that is too exciting. The location of the hele site relative to the other bits of the event is critical. You need to be close to the action or on the way from the car park at least. You don't want events that have other features that prevent or limit flying. You don't want to pay the event organiser too much - preferably a percentage of every pax flown. You don't want to have to position your helicopter too far either cos that is all non-revenue flying. It is also possible for an area to suffer from hele fatigue - after several years of pleasure flights a population will have been "flown out". You also have to be able to guarantee good weather too.
There is loads of advice from the Belgrano about what you need.
They do visit you fairly frequently too, so keep your house in order. From a drivers viewpoint, the worst thing is when a proper prior site visit has not been done properly. You are then under pressure to fly out of an "unsuitable" site - if you don't you probably won't fly for the same outfit again.
In practice, I think you will always need at least 4 people, and a lot more if you are busy: 1 pilot, 2 ground crew (to satisfy CAA standards) and someone to take and safeguard the money.