If only one image captured the spirit of the inaugural Boston Calling Music Festival, it happened toward the end of Sunday night. Matt Berninger, frontman for the National, was in the middle of a blistering set with his bandmates, when suddenly he walked out into the sea of cheering fans, estimated at 19,500 people, on City Hall Plaza.
Here was this nattily dressed New York indie rocker in a suit and jacket snaking his way through a crowd dotted with Red Sox caps and wide smiles that made it obvious: A two-day rock festival in the heart of Boston is an excellent idea.
The event was such a success that organizers announced another installment of the festival will take over City Hall again on Sept. 7-8. Full story for BostonGlobe.com subscribers.