That was my thought too
CBD. Imagine the logistics involved.
I imagine they had to take feed along as well. (unless it was catered
)
May 1939.
"Main arteries leading to Pasadena, Calif., are shown choked with thousands of cars, as an estimated 1,500,000 persons make their way to Pasadena, to attend annual Tournament of Roses, the Rose Bowl Football Classic, or a meeting at Santa Anita Race Track, nearby. This air view was from a T.W.A. Skyliner, from which Chief of Police C.H. Kelley of Pasadena, by means of a short wave radio, routed the heavy traffic to reduce congestion to a minimum."
eBay
I tried to line this vintage view up with a present day aerial but I couldn't figure it out..