What they did as a mash-up. They took the song "The Story of Tonight" from Hamilton and "You Will Be Found" from Dear Evan Hansen and figured out a wonderful way to edit (and perform) them together, calling it "Found/Tonight" -- all the better since the songs have a resonance to the issue at hand. Adding a nice touch, they begin by singing the other's song. And then it all blends from there.
Given that this is to raise money, I'm a bit surprised that they didn't display a website at the end, but for those interested it's here.