“Hand in Hand: A Benefit for Hurricane Relief" Organizers include music manager Scooter Braun (Bieber, Ariana Grande)

The festival is set to broadcast live and commercial-free on Sept. 12 on multiple networks, including ABC, CBS, FOX, HBO, and Bravo, and live-stream via Facebook, YouTube and Twitter, has added more than 40 celebrity supporters to the event’s lineup, along with underwriters the Michael & Susan Dell Foundation, which contributed $5 million, and Verizon, which contributed $2.5 million to the telethon as well as providing more than 2,000 call center volunteers.

Confirmed participants now include (in alphabetical order): Anthony Anderson, Bun B, J Balvin, Beyoncé, Justin Bieber, Connie Britton, George Clooney, Andy Cohen, Stephen Colbert, Sean “Diddy” Combs, Terry Crews, Billy Crystal, Ellen DeGeneres, Robert De Niro, Drake, Hilary Duff, Jourdan Dunn, Jamie Foxx, Richard Gere, Tom Hanks, Marcia Gay Harden, Faith Hill, Kate Hudson, Dwayne Johnson, Joe Jonas, Catherine Zeta-Jones, Nicole Kidman, Karlie Kloss, , Matt Lauer, Jay Leno, Zion & Lennox, Jared Leto, Eva Longoria, Rob Lowe, Matthew McConaughey, Tim McGraw, Tracy Morgan, Norah O’Donnell, Gerardo Ortiz, Chris Paul, Tyler Perry, Dennis Quaid, Questlove, Jeremy Renner, Julia Roberts, Kelly Rowland, Adam Sandler, Ryan Seacrest, Blake Shelton, David Spade, Gwen Stefani, Michael Strahan, George Strait, Barbra Streisand, Sofia Vergara, Kerry Washington, Chandra Wilson, Oprah Winfrey, Rita Wilson and Reese Witherspoon. More are expected to be announced in the coming days.

The festival is looking to provide expanded relief efforts to those who may be affected by the approaching Hurricane Irma in addition to those already impacted by Hurricane Harvey, which ripped through southern Texas between Aug. 25 and Sept. 2. Locations for the event include New York (Times Square), Los Angeles (Universal Studios), Nashville (Grand Ole Opry House), and San Antonio (Majestic Theatre).