You might get more responses if you posted this in the racing and big mountain skiing sub-forum, rather than here. That said:
Tichy Racing will have September-October 2008 fall camps at Mt. Hood, with Thursday night arrival, Sunday night departure.http://www.tichyracing.com/
As Fall/Winter comes around, you might also check out the Modern Ski Racing guys. (My favorite weekend clinic ever was with them.) At:http://www.modernskiracing.com/clinics.php
In November, the Tichys and several other organizations do one-week camps out at Copper Mountain, Colorado. Due to the insufferably high altitude, they typically have plenty of snow, at least where the gates are set. Have fun.