You can purchase Porscheplatz tickets ($120.75) at https://canadiantiremotorsportpark.com/products/mobil-1-sportscar-grand-prix?variant=2283663327241
The ticket provides access to a private tented area and parking adjacent to the front straight to watch two major races of the year: WeatherTech Sportscar Championship and Continental Tire Sports Car Challenge. You also have the chance to drive your Porsche on track in a parade lap on Sunday @10:50am. There is also a BBQ lunch on Sunday.
Full details in the PDF file: http://pcaucr.org/wp-content/uploads/2017/07/2017-CTMP-Porscheplatz-Agenda-V3-20170613.pdf