The Great Summerfest Grounds Stage Headliners Announcement Wave of 2021 is almost over – but before the Big Gig calls wraps things up, we've got to reveal the headliner schedule for the Johnson Controls World Sound Stage, featuring acts like Ani DiFranco, Future Islands, Indigo Girls and more. 

Here's the lineup:

Sept. 2

8 p.m. – Fousheé

Sept. 3

6:45 p.m. – Victoria Canal
8 p.m. – Indigo Girls

Sept. 4

6:45 p.m. – JD McPherson
8 p.m. – Drive by Truckers

Sept. 9

6:45 p.m. – Peter Mulvey & Sista Strings
8 p.m. – Ani DiFranco

Sept. 10

6:45 p.m. – TORRES
8 p.m. – Jade Bird

Sept. 11

8 p.m. – Tank and the Bangas

Sept. 16

6:45 p.m. – Caley Conway
8 p.m. – Liz Phair

Sept. 17

6:45 p.m. – Future Islands
8 p.m. – Fishbone

Sept. 18

6:45 p.m. – Moon City Masters
8 p.m. – Sheila E. 

For tickets and more information, visit Summerfest's website. And for more Big Gig updates, stay tuned to OnMilwaukee. One ... more ... announcement ... to go ...