Recently Laguna Seca staged the Continental Tire Monterey Grand Prix which included all four classes of the TUDOR Championship.
The TUDOR Championship merges both the Grand-Am and ALMS series into a single weekend but the races are still somewhat fragmented. For instance they run Grand-Am cars and Oreca prototypes separate from the Le Mans GTE cars and American Prototype cars. Hopefully future years will sort out which prototype and GT cars take over entirely.
Our gallery from Monterey includes all four classes from Tudor and a bonus gallery of the Lamborghini Super Trofeo North America from local photographer extraordinaire Steve Burton: