She passed away on July 26, aged 22, after being in a coma for nearly six months. She was found lying facedown in her bathtub at her home in January.
The 46-year-old R&B singer performed alongside singer Macy Gray at the Hollywood Bowl in Los Angeles, reported Us Weekly Magazine.
The ex-husband of the late Whitney Houston was not scheduled to appear but surprised the crowd to sing a duet with Gray on the song "Real Love."
Bobbi Kristina was buried next to her mother on August 3 at the Fairview Cemetery in Westfield, New Jersey.