One of my friends on the Porsche club forums has built up a massive list of trackdays between Mission/Seattle/Portland/California.
(Note, you don't have to be a Porsche club member to come to a Porsche club track day - the same goes for many other clubs)
I will try to keep it updated as new dates get added.
March
01 - Laguna Seca - Trackmasters
01 - Portland - Oregon PCA - DE/Lapping
01 - Infineon - Checkered Flag
06 - Streets of Willow - Speedventures
18 - Laguna - Hooked on Driving
19,20 - Infineon - Trackmasters and Speedventures
20 - Portland - Team Continental
21,22 - Thunderhill - NCRC
30 - Pacific Raceways - Proformance - afternoon lapping
31 - Pacific Raceways - Proformance
April
03 - Miller Motorsport Park - open lapping
08 - Laguna - Trackmasters
10 - Pacific - PCA - PNWR DE
13 - Laguna - NCRC
16 - Pacific - BMW CC Puget Sound DE
16,17 - Thunderhill - Hooked on Driving
17 - Miller Motorsport Park - open lapping
17 - Thunderhill - Trackmasters
18,19 - Oregon Raceway Park - Oregon PCA - Advanced lapping
18,19 - Buttonwillow - Speedventures
18,19 - Thunderhill - Nor Cal Shelby club
20 - Seattle Proformance - afternoon lapping
20 - Laguna - Checkered Flag
24 - Thunderhill - Trackmasters
25 - Miller Motorsport Park east - PCA Intermountain
28 - Pacific Raceways- Proformance - afternoon lapping
29 - Pacific - Proformance
30 - Laguna- Trackmasters
May
01 - Thunderhill - NCRC
01 - Miller Motorsport Park - open lapping
01 - Willow Springs - Speedventures
06 - Mission Raceways - UBCSCC
04 - Infineon - Trackmasters
09,10 - Streets of Willow -Speedventures
15- Oregon Raceway Park - Team Continental
15 - Thunderhill - Hooked on Driving
15,16,17 - Auto Club Speedway (Fontana) - Speedventures
17 - Portland - Oregon PCA - DE
18 - Miller Motorsport Park west - Lapping Days
18 - Thunderhill forward - Checkered Flag
20 - Pacific Raceways - Chris's German
21 - Pacific - BMW CC Puget Sound DE
25,26 - Laguna - Greenflag
26 - Portland - PCA advanced lapping
26 - Pacific Raceways- Proformance - afternoon lapping
27 - Pacific Raceways/Proformance
27 - Laguna - Trackmasters
29 - Thunderhill - Trackmasters
29 - Mission - PCACWR - DE
30,31 - Buttonwillow - Speedventures
June
01 - Mission Raceways - UBCSCC
05 - Miller Motorsport Park - open lapping
06,07 - Buttonwillow - NCRC
06,07 - Thunderhill - Hooked on Driving
08 - Mission - VCMC
08 - Laguna - Trackmasters
09 - Portland Grand Prix Imports
10 - Pacific - PCA - NWR DE
13,14 - Auto Club Speedway (Fontana) - Speedventures
15 - Pacific - Weissach/Proformance
19 - Streets of Willow - Speedventures
20 - Portland - PCA Oregon and PCA NWR - tentative
20,21 - Thunderhill - NCRC
20,21 - Oregon Raceway Park - Oregon PCA - HPDE
24 - Pacific Raceways/Proformance
25 - Portland - Prodrive street car track day.
25 - Mission - Jeff Alton???
27 - Portland - Team Continental
27,28 - Willow Springs - Speedventures
29 - Miller Motorsport Park east - Lapping Days
July
06 - Mission Raceways - UBSCC
10 - Pacific - BMW CC Puget Sound DE
11 - Miller Motorsport Park west - PCA Intermountain
17 - Miller Motorsport Park - open lapping
21 - Portland - Oregon PCA DE
21 - Pacific Raceways/Proformance
22 - Pacific - NW Alfa
27 - Miller Motorsport Park east - Lapping Days
29 - Pacific - PCA NWR
31 - Mission - PCACWR - lapping
31 - Portland - Prodrive street car track day.
August
13 - Pacific - PCA NWR
14 - Portland - Poformance fieldtrip ( changed from 13th)
15 - Oregon Raceway Park - Proformance fieldtrip # 2
14,16 - Monterey Historic Races - Laguna (Spectator event) California PCA clubs will have activities
20 - Portland - Oregon PCA de
20 - Mission - Jeff Alton???
21 - Thunderhill - Trackmasters
21 - Miller Motorsport Park - open lapping
25 - Pacific Raceways- Proformance - afternoon lapping
26 - Pacific Raceways/Proformance
27 - Portland - Prodrive street car track day.
29,30 - Infineon- Greenflag invited by Nor Cal Shelby club (Endless summer event)
29,30 -Thunderhill - NCRC
31 - Miller Motorsport Park west - Lapping Days
Sept
02 - Pacific Raceways/Proformance
03 - Pacific - PCA NWR
08 - Pacific Raceways- Proformance - afternoon lapping
09 - Pacific- Chris's German/Proformance
11 - Thunderhill - Trackmasters
13 - Pacific - BMW CC Puget Sound DE
14 - Pacific- Weissach/Proformance
17 - Portland Grand Prix Imports
18 - Mission - PCACWR - DE
20 - Portland - Oregon PCA - advanced lapping
21 - Mission - VCMC
25 - Thunderhill - NCRC
25,26,27 - Miller Motorsport Park full track - PCA Intermountain DE all 3 days plus races
26,27 - Thunderhill - Greenflag
28 - Thunderhill backwards - Checkered Flag
October
01 - Pacific - PCA NWR
02 - Thunderhill - Trackmasters
04 - Portland - Oregon PCA DE
08,09 - Infineon- Trackmasters
09,11 - Monterey Sports Car Challenge final race - Laguna (spectator event)
12 - Pacific Raceways/Proformance
12 - Portland - BMWCCBC - might not happen as appears to be double-booked.
17,18 - Thunderhill - Nor Cal Shelby club
23 - Infineon - Trackmasters
25 - Mission - VCMC
November
06 - Infineon - Trackmasters
21 - Infineon - Trackmasters
30 - Thunderhill - NCRC
UBC Sports Car Club
http://www.ubcscc.com/
Vancouver Chinese Motorsports Club
http://www.vcmc.ca
Proformance Seattle
http://www.proformanceracingschool.com/
Trackmasters
http://www.trackmasters-racing.com/
Northern California Racing Club
http://www.ncracing.org/
Hooked on Driving
http://www.hookedondriving.com/home.cfm
Greenflag
http://www.greenflagdriving.com/
Speed Ventures
http://www.speedventures.com/events/Default.aspx
PCA - CWR
http://www.pca-cwr.org/
Oregon PCA
http://www.oregonpca.org/
PCA NWR
http://www.pnwr.org/
BMWCCBC
http://bmwccbc.org/schools/index.html
Oregon Raceway Park
http://www.oregonraceway.com/index.htm
NorCal Shelby Club
http://www.norcal-saac.org/
Weissach
http://www.weissach.com/events.asp
Lapping Days at Miller
http://lappingdays.com/
PCA Intermountain
http://int.pca.org:80/track/index.htm
Team continental -
http://www.teamcontinental.com/
Cascade Sports Car Club
http://www.cascadesportscarclub.org
Miller Motorsport Park
http://millermotorsportspark.com/
BMW Car Club Puget Sound
http://www.bmwpugetsound.com/
Las Vegas PCA
http://www.lvrpca.com/events.html
Grand Prix Imports
http://gpimports.com/
IRDC
http://www.irdc-racing.com/irdc_school.htm