The contestants will parade on the stage near Macy's, starting at 2 p.m.
Mother's Day is May 11.
The mall will also host a Family Fun Night with magician Kathy Hoffman on May 15 from 6 p.m. to 7 p.m. in the mall's Center Court.
Admission to both events is free.
The Gallery at South DeKalb is at 2801 Candler Road in Decatur.
For more information, visit www.galleryatsouthdekalb.com or call 404-241-2431.