Five IMSA series head to Road America in Elkhart Lake, Wisconsin this weekend. “America’s National Park of Speed” will host the flagship IMSA WeatherTech SportsCar Championship race on Sunday, August 4 with the NBCSN broadcast at 6 p.m. ET. Live, flag-to-flag streaming will be available on the NBC Sports App and NBCSports.com starting at 2:35 p.m. ET / 1:35 p.m. CT.