Hi Stephen,
In past years the NOR stated that single and double-handed divisions were only available for the Sunday series. This year the Express 27 fleet agreed to race double-handed both days and this caused some other shorthanders to enter the Saturday series. AFAIK there's no reason you can't race singlehanded in both series - Paul Sutchek appears to be doing that.
Where do you (or will you) keep your boat?