Alan Jackson, Brittney Spencer and two additional artists have been added to the 2021 ACM Honors performance lineup. The show is set for Wednesday (Aug. 25) at the Ryman Auditorium in downtown Nashville.

In addition to Jackson and Spencer, Trace Adkins — who had already been announced as a 2021 ACM Honors presenter — and Ronnie Dunn have joined the awards show's performance lineup. They complete a list of performers that already includes Carly Pearce — also the show's host — Keith Urban, Sam Williams, Jessie Jo Dillon, Nicolle Galyon, Jordan Reynolds, Laura Veltz, Ashley McBrydeLee Ann Womack, Lauren AlainaDevin DawsonSara EvansHardyChris JansonLady A and RaeLynn.

Jamey Johnson and 2021 ACM Merle Haggard Spirit Award winner Toby Keith were previously announced as performers but are no longer in the lineup.

The 2021 ACM Honors will recognize Keith, Loretta LynnDan + Shay and more country stars for special achievements within the industry; 2020 and 2021 studio recording award winners and 2020 industry award winners are also honored at the event. In addition to Adkins, presenters for the evening include Janson and Country Music Association CEO Sarah Trahern.

The 2021 ACM Honors will be livestreamed on the Circle Network's Facebook, Twitter and YouTube pages. The TV network will also air a special featuring footage from the event on Nov. 23.

Ahead of the 2021 ACM Honors, the Academy of Country Music will host its annual Party for a Cause at Nashville's Ascend Amphitheater on Tuesday (Aug. 24). The event — which benefits Lifting Lives, the ACM's charitable arm, and usually precedes the ACM Awards — will feature performances from Trisha YearwoodMickey Guyton and more.

PICS: The Best of the 2021 ACM Red Carpet:

The best dressed on the 2021 ACM Awards red carpet brought color — lots of color — for an awards show that promises to be a celebration. Photos show stars like Carly Pearce, Kelsea Ballerini, Chris Young, Kane Brown and more wearing the hottest and often most expensive designer outfits, or suits they designed themselves, in the case of Jimmie Allen.

Check out a full gallery of country music's hottest stars on the ACM Awards red carpet. Who do you think is best dressed and worst dressed?

The 2021 ACM Awards took place at the Bluebird Cafe, Grand Ole Opry and Ryman Auditorium in Nashville on Sunday (April 18).