“California, Los Angeles, Altadena, the Palisades — we are in this together,” Green Day’s frontman Billie Joe Armstrong screamed to a sold-out crowd at L.A.’s Kia Forum on Thursday for the FireAid wildfire benefit concert.

As the first act of the star-studded evening, the iconic rock band kicked off the show with their 2009 track “Last Night on Earth,” bringing out fellow artist Billie Eilish to perform. The group reiterated that everyone was “in this together.”

Actor and comedian Billy Crystal, who lost his home in the Palisades Fire, took the stage after Green Day to officially welcome the crowd. He spoke about his own experience, telling concertgoers that he was wearing the clothes when he evacuated from his home and which he wore for a week. He announced that all donations of the night would be matched by Clippers owner Steve Ballmer and his wife, Connie Snyder, the...