The number of races is to be determined at this point. We have two scheduled, and one other so far who have stated a willingness to host: Peter and Tsooko (Please correct me if things have changed)
I was trying to figure a way to give you the option to enter single races if you'd like. If one does not wish to enter the series, It stands to reason one would not be eligible to compete in a series one is not entered into..
Peter mentions having the ability to have your car sent home between races if you pay the freight. That seems reasonable, and if you miss a race, you won't be DQd from the series.
So how about this. Enter the series, have your car returned between races if desired, and skip an event or two if you want. You'll be eligible for overall standings and the concours. Just a thought. I don't think in this case, though, it would be fair to be able to change cars mid-series.
One reason for the boxing all the cars up and sending to the next event is consideration for the hosts. After hosting an event, shipping to the next venue should be kept as simple as possible to keep things moving.