Head up to Kettering’s outdoor “mini-shed” Fraze Pavilion this weekend for a very rare chance to catch two of the most influential female musical artists of our times. Both Rock and Roll of Famers, Bonnie Raitt and Mavis Staples represent an impressive range of American Blues/Rock/R&B history.You Are Not Alone on her current label home (the hip Anti Records), her contributions with Staples Singers were crucial. The Blues will be blustering and the Soul will be soulful, perhaps more than at any other concert you’ll see this summer. 7:30 p.m. Saturday Aug. 18. $40.50. Fraze Pavilion, Kettering. fraze.com.