At the vantage ride last year I only needed to show up and pay the entry fee. No memberships, sound tests, spark arrestor checks, or anything. No memberships required.
They got us on a gate fee (5$ a head?) when we arrived but I considered that my campground fee since I slept in the truck the night before.
There were hundreds of trucks and rvs. A city was formed in the desert.
The club put on a good rider's meeting and all the finishers got t-shirts so what the heck, the entry fee just got smaller.
The course was a couple laps around a long loop. This meant a guy (who wasn't racing) could fill up his tank and have a rest at the truck after lap one.