Here is a link which shows whats going at, what is called, the Pebble Beach Automotive week. Note, it is a 5 day event culminating with the "Concours day", Sunday the 18th.
http://www.pebblebeachconcours.net/pages/3005
I am told the Concept Cars, shown on the 18th, are going to be located primarily at the Practice Putting Green with, if necessary, over flow cars on the Peter Hay Hill, par 3 course. The Practice Putting Green is closed only 1 day of the year and that's Concours day. Which means the M4 might only be available to see on that one day. On the other hand, if they park it on the overflow site, it might be available for viewing for more than that.
The website gives a number to call for tickets but they also answer questions.