REMOVE

1. spectators (event observers)
2. paths
3. barriers
4. polo fields
5. automobiles

WHAT

1. Visual Works (hierarchy n … (1)
2. athletes (1)
3. black-and-white film (1)

More 

WHERE

1. Aiken, South Carolina (1)

WHO

1. Clyfford Still; Still, Cl … (1)
2. Still, Clyfford (1)

WHEN

1. 1966 (1)