Which of the following sentences is punctuated correctly?
A.
On an August weekend in 1969, about 400,000 people came to a rock concert called Woodstock.
B.
On an August, weekend in 1969, about 400000 people came to a rock concert called Woodstock.
C.
On an August, weekend in 1969 about 400000 people came to a rock concert called Woodstock
D.
On an August weekend in 1969 about 400000 people came to a rock concert called Woodstock