According to NATs management, there will be NO practice sites available at the NATs the weekend before the NATs starts. They are flying CL and RC Scale that weekend and all CL sites will either be in use (the McCool Racing circles for CL Scale) or in the overflight region (the L-Pad and the Speed circles for RC Scale).
Note: I didn't ask about any of the 600'x600' grass pad. There MIGHT be some circles available there: I just don't know.
Regards,
Bill Lee