In my case, I usually, participate in the 50% of the events, not all events. The members of "The Flotilla" participate in greater or lesser degree like me. But yes, it is a busy (and expensive) schedule. The distance between these events is no more than 300km. There are other events in Spain wich are more far, but this list is made for Presidents of RC Boat Associations wich are near Barcelona. For example, in the Castellon event (300km from Barcelona) there are people who travel from Madrid or from Cantabria, 500 or 800 km, but this are "rare" people. Here in Spain the gas and the toll highway are more expensive than USA or Netherlands. I travelled once time a lot of years ago to Netherlands and I don't remember toll highgway. And luckily the distances in your Country are smaller than Spain. And flat.
The main reasons to participate in an Event, are the friends, the quality of the shipping place, and the distance from our "base-harbor". The Job and the family don't allow more than this.