The MHAR Porsche Corral is being sponsored by the Monterey Bay Region of the PCA. If you follow the links
http://mby.pca.org/ you will find that the corral pass requires paying a MBR membership fee. The PCA corral package is $77 plus tickets. The interesting thing is that they're splitting the corral in Turn 5 with the GGC BMWCCA
http://www.festorics.org who are only charging $62 plus tickets for one car and up to four wrist-bands for the tent/drinks/seating area. My Porsche is more "historic" but I'm tempted to go in my '04 BMW and save a few bucks! Even better, with no featured marque this year ('88: Porsche, '98: Porsche, '08: "Sorry Steve, but we just did Rennsport...") the general parking may be within walking distance. It always is on Friday and Sunday anyway.