This event is hosted by our friends at the Willamette Valley Miata Club. You can register here:
http://www.oregonmx5.com/
This is a small event--only 15 cars will be admitted. This group always puts on a well-executed and first-class drive, no matter what, so if you would like to join them, check out this information from their website and advertising about the drive:
PUGET SOUND MIATA CLUB1989 - 2024