The participant list is greater than what I've seen listed here and other posts. Wikipedia lists them but here they are as of 9/28.
Participants:
Aziz Ansari
Hannibal Buress
Bill Burr
Jimmy Carr
Dave Chappelle
Louis C.K.
Whitney Cummings
Pete Davidson
Christ Distefano
Omid Djalili
Zarna Garg
Kevin Hart (edit/spelling)
Gabriel Iglesias
Jim Jefferies
Jimeoin
Maz Jobrani
Jessica Kirson
Jo Koy
Bobby Lee
Sebastian Maniscalco
Sam Morril
Mark Normand
Nimesh Patel
Russell Peters
Jeff Ross
Andrew Santino
Andrew Schulz
Tom Segura
Jack Whitehall
Ali Siddiq
Ben Hart
Aries Spears
Mo Amer
Wayne Brady
The short list of who have declined shows as: Shane Gillis, Stavros Halkias, and Atsuko Okatsuka. Tim Dillon was intending to participate but was removed due to previously made jokes.
Marc Maron, Shane Gillis, Gianmarco Soresi, and Zack Woods have criticized the event and the performers.