They did a tribute to the latest Rock & Roll Hall of Fame inductees. Alan White from Yes, now a Seattle native, joined them when playing Roundabout. Props to the band for making the classic Roger Dean Yes logo during the performance.
My 14-year-old recently went nuts when "Roundabout" came up on one of my playlists. I'm sure he'd heard it before, but this time he was all over it. Turns out that it's used in the "To be continued..." meme, as shown below: