On January 30, 2 tandem concerts were held in L.A. at the Intuit Dome and Kia Forum to benefit victims of the devastating wildfires that recently tore through the city. For those unable to attend, here are some stand-out moments from both events.

Billie Joe Armstrong and Billie Eilish. Green Day got things started at the Kia Forum, where they surprised fans with Eilish to help them perform, "Last Night on Earth" from 2009's 21st Century Breakdown.

Billie Eilish made a surprise appearance on stage with Green Day on Thursday to kick off one of two star-studded concerts in Los Angeles put together to raise funds for people affected by deadly wildfires in California this month.