Sen. Elizabeth Warren (D-Mass); comics Desus Nice and The Kid Mero; Vic Mensa performs. ...

TV hostess Norah O'Donnell (CBS This Morning (1992)); Dead and Company perform. ...

TV hostess Norah O'Donnell (CBS This Morning (1992)); Dead and Company perform. ...

Actor Ben Affleck (Justice League (2017)); writer/director Greta Gerwig (Lady Bird (2017)); Dead and Company perform. ...

Actor Ben Affleck (Justice League (2017)); writer/director Greta Gerwig (Lady Bird (2017)); Dead and Company perform. ...

Actor Jordan Peele (Get Out); actress Alia Shawkat (Arrested Development and Search Party); comic Paul Mecurio performs. ...

Actor Jordan Peele (Get Out); actress Alia Shawkat (Arrested Development and Search Party); comic Paul Mecurio performs. ...

Tyler Perry (The Star (2017)); actor Anthony Atamanuik (Tracey Breaks the News (2017)); journalist John Avlon. ...

Tyler Perry (The Star (2017)); actor Anthony Atamanuik (Tracey Breaks the News (2017)); journalist John Avlon. ...

Former Vice President Joe Biden (book, Promise Me, Dad: A Year of Hope, Hardship, and Purpose); Elton John performs. ...

Former Vice President Joe Biden (book, Promise Me, Dad: A Year of Hope, Hardship, and Purpose); Elton John performs. ...

Comic John Mulaney (Big Mouth (2017)); actor Jason Segel. ...

Comic John Mulaney (Big Mouth (2017)); actor Jason Segel. ...

Louis C.K.; actor Jay Pharoah (White Famous (2017)); Rationale perform. ...

Louis C.K.; actor Jay Pharoah (White Famous (2017)); Rationale perform. ...

Actor Norman Reedus (The Walking Dead (2010)); actor Sean Astin (Stranger Things (2016) and Teenage Mutant Ninja Turtles (2012)); comic Pat McGann performs. ...

Actor Norman Reedus (The Walking Dead (2010)); actor Sean Astin (Stranger Things (2016) and Teenage Mutant Ninja Turtles (2012)); comic Pat McGann performs. ...

Actor Jason Segel; producer Jeff Fager and journalist Lesley Stahl (60 Minutes (1968)); Mavis Staples performs. ...

Actor Jason Segel; producer Jeff Fager and journalist Lesley Stahl (60 Minutes (1968)); Mavis Staples performs. ...

Actor Josh Gad (Murder on the Orient Express (2017)); TV host Lawrence O'Donnell (The Last Word with Lawrence O'Donnell (2010)); magician Derek DelGaudio. ...

Actor Josh Gad (Murder on the Orient Express (2017)); TV host Lawrence O'Donnell (The Last Word with Lawrence O'Donnell (2010)); magician Derek DelGaudio. ...

Journalist Ronan Farrow (Ronan Farrow Daily (2014)); author Walter Isaacson; Kelsea Ballerini performs. ...

Journalist Ronan Farrow (Ronan Farrow Daily (2014)); author Walter Isaacson; Kelsea Ballerini performs. ...

Whoopi Goldberg (The View (1997)); actress Kathryn Hahn (A Bad Moms Christmas (2017)); Courtney Barnett and Kurt Vile perform. ...

Whoopi Goldberg (The View (1997)); actress Kathryn Hahn (A Bad Moms Christmas (2017)); Courtney Barnett and Kurt Vile perform. ...

Actress Nicole Kidman (The Killing of a Sacred Deer (2017)); actor Jonathan Groff (Mindhunter (2017)); author Walter Isaacson; ...

Actress Nicole Kidman (The Killing of a Sacred Deer (2017)); actor Jonathan Groff (Mindhunter (2017)); author Walter Isaacson; ...

Actor Mark Ruffalo (Thor: Ragnarok (2017)); Chris Matthews (Hardball with Chris Matthews (1997)); actor Gilbert Gottfried; Thundercat sit in with Jonathan Batiste and Sta ...

Actor Mark Ruffalo (Thor: Ragnarok (2017)); Chris Matthews (Hardball with Chris Matthews (1997)); actor Gilbert Gottfried; Thundercat sit in with Jonathan Batiste and Sta ...

Actor Billy Eichner (Billy on the Street with Billy Eichner (2011)); actress Anna Camp (Pitch Perfect 3 (2017)); Weezer perform. ...

Actor Billy Eichner (Billy on the Street with Billy Eichner (2011)); actress Anna Camp (Pitch Perfect 3 (2017)); Weezer perform. ...

Dr. Phil McGraw (Dr. Phil (2002)); retired astronaut Scott Kelly. ...