The danger of lightning forced the group to abruptly cancel a concert in June.
The rainout left people who had been waiting for hours heading home disappointed, without a show.
The concert on the Great Lawn went from 7 - 10 p.m.
Even though the concert was free, people needed tickets to enter, and they waited for hours to get the perfect spot on the lawn.
The concert was a benefit for the Robin Hood Foundation, an anti-poverty organization.
Some 60,000 spectators were in attendance. Those who won or bought tickets to the June 9 show got emails with instructions on how to claim their replacement tickets. A small number of additional tickets were also made available.