I found it last night. The Rocky Mountain area time for the 200 is 7:00 Tonight-9:30. Should be fun to watch. The stands are always empty looking when they pan the cameras compared to other races. I guess folks don't go to Daytona for bike racing!
The stands hold an incredibly large number of people. NASCAR seating chart is 240,000 seats, and everybody's in the stands.
For road racing, the stands are available, but most people wander the infield to stay close to the track. Except for the finish, the stands remain almost completely empty, and even then most of the stands are empty, with the crowd hanging around between the trioval and turn 1, to get that finish-line shot.
Even so, the attendance for bike races and the 24 hours is nothing like the NASCAR attendance. Still more folks than most major league baseball games, and more than a lot of college football games.