On a serious note, Madman, this is for real.
You have just highlighted the reason why these dates were chosen. According to your Castle Hill web site, it states that 15th is a non pointscore night (can someone correct me if this has changed?). Second, the site doesn't mention that there is any racing on the 22nd, whereas, at Windsor, I have been told they will race on the 22nd.
As you can see, so far, everything with timing is falling into place. It will be good to have a race meet with a little humour on the side and hopefully give drivers from both clubs a very enjoyable 2 nights worth of racing. Also, I want to encourage the Novices of both clubs. This will also give them a taste of what it is like to race with other clubs involved.