I just got the word from Forrest just a few minutes ago on the official dates for the 2013 World Championships (for wing cars) to be held at Buena Park Raceway...

May 15th - G27L
May 16th - G27
May 17th - practice day
May 18th - OMO
May 19th - G7

There will be no pit fee for racers at the World.

Buena Park Raceway‎
6161 Lincoln Avenue
Buena Park, CA 90620
(714) 827-9979
http://www.bpraceway.com