From the RA web site:

The IMSA WeatherTech® SportsCar Championship and IMSA Michelin Pilot Challenge takes over Road America’s four-mile circuit for what will be one of the most incredible weekends of sports car racing in the world. Fans will get to see the IMSA Michelin Pilot Challenge race on Saturday, Aug. 3, with the WeatherTech® SportsCar Championship race on Sunday, Aug. 4., plus races from the IMSA Porsche GT3 Cup Challenge USA all weekend. Fan activities include an open grid, autographs, tech talks, fan forums, and car corrals.