I'm sure you're aware of this, but in the event that you're not, in regard to corral passes for Monterrey:
This is an excerpt from the August 10th, ARA Overhead Cams publication:
"Advance Ticket and Corral Pass orders for the Historic Races are no longer available through ARA, but through the generous auspices of the staff at Mazda Raceway Laguna Seca it may be possible to obtain a limited number of passes and tickets to be picked up at Will Call once you arrive in Monterey. The Will Call booth is located in the lobby of the Embassy Suites in Seaside, just off Hwy 1 north of Monterey. You may email me at email@example.com (preferably) for details or call my cell phone 925-997-3637. It is nice to have friends in the right places. Do not count on this service in the future..."