Picked up a flier at the Vintage Races last weekend. There will be a new Global Tuner Challenge event at Laguna Seca late this year. Oct 22-24.
I haven't read the rules but believe it's a Time Attack type event open to any street legal car, so a Pro-Touring type car would be eligible, just not sure which category.
More info here: http://www.globaltunergp.com/