Bonnie Raitt and Taj Mahal

When: 7:30 p.m. Tuesday.

Where: The Lawn at White River State Park, 801 W. Washington St.

Tickets: $29.75 to $62.25. For information, visit www.livenation.com, or call (877) 598-8703.

Bonnie Raitt and Taj Mahal emerged as young blues musicians during the Woodstock era. Mahal’s debut album was released in 1968, and Raitt’s arrived in 1971, but this summer’s “Alone and Together” excursion is the first time the Grammy Award winners have toured together.

At the Lawn, the singer-guitarists will play songs with their respective bands before joining forces for a string of duets.

Raitt and Mahal collaborated on renditions of “She Caught the Katy” and “Done Changed My Way of Living” during recent TV appearances.

— David Lindquist

IndyFringe Festival

When: Various times through Aug. 30.

Where: Earth House, 237 N. East St.; ComedySportz Arena, 721 Massachusetts Ave.; Phoenix Theatre, 749 N. Park Ave.; Theatre on the Square, 627 Massachusetts Ave.; IndyFringe Theatre Building, 719 E. St. Clair St.

Tickets: All shows are $10 for adults, $7 for students and $5 for children younger than 12. A one-time $3 purchase of a Backer Button is also required to attend shows. Multiple-show passes are available. For more information, call (317) 522-8099, or visit www.indyfringe.org.

The 10-day event — which kicked off Friday — features 53 performers from the U.S. and abroad and 276 shows on six stages along the Mass Ave. cultural district.

You also can check out the skills of Indiana youths during FringeNext.

— Shelby Roby-Terry

Knollfest

When: 11 a.m. to 11 p.m. Saturday.

Where: Berkley Road knoll, between 43rd and 44th streets near the Butler University campus.

Tickets: $10. For more information, visit www.knollfest.com.

Last year, several up-and-coming Midwest-area bands performed on the grassy knoll on Berkley Road to raise money for art and music departments at several IPS schools.

The event — dubbed Knollfest — was such a success that organizers are back with the second edition.

The goal is to donate at least $1,500 to Broad Ripple Magnet School for the Arts, while promoting local bands and DJs, including Groovatron, Twin Cats, Ladymoon, Shaggy Wonda, Midwest Hype, Daphne from Daphne Willis&Co., Oreo Jones, DJ MetroGnome, The Ragbirds and more.

After the music wraps up on the knoll, head to the official after-parties with Midwest Hype and The Ragbirds at the Jazz Kitchen, and the Twin Cats at the Mousetrap.

— Shelby Roby-Terry