within MOTA (Michigan Ontario Trials Association) we have 6 Clubs, each club hosts 2 events per season. For a rider to be awarded season championship points they must work 2 events per season.
This is how we get the majority of our observers, the members of the club will set up, run, observe their 2 events for the season. and then you ride the other 10. Season championship standings are determined by your best 8 rides.
It seems to work pretty good.
But you do not have to be a member of one of the clubs to ride the events. You will get a trophy that day (provided you finish in the top 3) but you will not be awarded season championship points for the year end awards.