Read the following article and answer the question by choosing from the options.

The Whigs got a sweet spot in the lineup , as they went on during sundown . In the film business , it 's called the magic hour -- when there 's still light out , but no sun . The one thing I have n't mentioned was that for the most part , the band 's sets did n't overlap too much .

What type of event is the speaker describing ?
Available choices:
a). A movie shoot .;
b). None of the above choices .;
c). A political debate .;
d). A concert .;...A:
d).