Cause Effect: The ACM Party for a Cause Festival in Las Vegas included live music and some surprises. Carrie Underwood headlined Friday's (4/1) ACM Women of Country Night, with Cam, Kelsea Ballerini, Martina McBride, Kellie Pickler, Maddie & Tae, Lauren Alaina, Kelleigh Bannen, Brandy Clark, Jana Kramer and a surprise appearance by Miranda Lambert, who joined Underwood for "Something Bad." Alaina, Bannen, Pickler and Kramer performed "Before He Cheats" with Underwood for the finale. ACM CEO Bob Romeo presented Underwood with the ACM Lifting Lives Gary Haber Award and Ballerini with the New Female Artist of the Year trophy.

Dierks Bentley headlined Saturday night (4/2), with performances by Frankie Ballard, Lee Brice, Chris Janson, Dustin Lynch, Chris Stapleton, Chris Young, Chase Bryant, Chris Lane, A Thousand Horses, Jackson Michelson and Courtney Cole. Charles Kelley and Eric Paslay joined Bentley for "The Driver." Romeo presented Stapleton with the New Male Artist of the Year award. Brice presented military widow Ginger Ravella with a truck that once belonged to her late husband and was sold before his deployment. Luke Bryan and Justin Moore hosted the ACM & Cabela's Celebrity Tic-Tac-Toe Archery Tournament, won by Team Justin in a sudden-death shootout.

Kenny Chesney closed out the festival Sunday (4/3), joined by Kip Moore, Sam Hunt, Chase Rice, Brett Eldredge, Old Dominion, Granger Smith, Lindsay Ell and Maren Morris. Romeo presented Old Dominion with the ACM for New Duo/Group of the Year.