One of the great challenges faced by the events during Grammy Week, including the FireAid benefit, is how to set the proper tone: How do you have a celebratory event like big concert or awards show ...

Green Day kicked off FireAid ... The band started things with the American Idiot deep cut “Last Night on Earth” and welcomed special guest Billie Eilish to perform onstage with them.

Green Day and Billie Eilish provided a perfect answer ... Joe Armstrong sang the first verse of that song, “Last Night on Earth,” from the band’s 2009 album “21 st Century Breakdown ...