Simon,

There's just not many cat enthusiast's in the SF area.
All that was required was a registration form/fee to enter.
(I was busy getting married and honeymooning.)

Gone are the days when the C-Class, 18 squares and 18ft skiffs were all racing here within weeks of each other.
I do recall an unofficial reaching dual between a C-Class and an 18ft skiff (Color 7) I believe, in the early eighties that the C-Class won.