Conversation so far:
What kind of personnel changes were happening with Martha and the Vandellas?
Motown struggled to find good material for many acts after the exit of Motown contributor and Reeves' mentor William Mickey Stevenson in 1967 and Holland–Dozier–Holland in early 1968.
Did Martha and the Vandellas still have any hit music during their personnel changes?
Martha and the Vandellas continued to find success with the singles Love Bug Leave My Heart Alone and Honey Chile added to their already extended list of charted singles.
What else happened with Martha and the Vandellas in their career besides the personnel changes?
That same year, label changes had started to take effect.
What label changes started to take effect with Martha and the Vandellas during their personnel changes?
Label CEO Berry Gordy focused much of his attention on building the Supremes.
What other changes were occuring with Martha and the Vandellas and CEO Berry Gordy focusing his attention to The Supremes?
Berry Gordy focused much of his attention on Diana Ross' burgeoning upcoming solo career.
What additional problems with Martha and the Vandellas were happening due to the personnel changes?
Martha and the Vandellas' chart performance suffered as a result.
Did Martha and the Vandellas have any other internal struggles going on besides the personnel changes?
It was the infighting among the members of Martha and the Vandellas that led to their problems. Kelley was the first to be let go after reportedly missing shows.
Did Martha and the Vandellas have any hits during these personnel changes and infighting among members?
Martha and the Vandellas records including Honey Love, Sweet Darlin' and Taking My Love and Leaving Me were issued as singles with diminishing success.
Is there anything else interesting that happened during the personnel changes of Martha and the Vandellas around 1967-1968?
In the summer of 1968, Martha and the Vandellas joined The Supremes, The Temptations, The Four Tops and Marvin Gaye in performing.

Question: Where were they performing?
Self-contained rewrite: Where were Martha and the Vandellas performing at with The Supremes, The Temptations, The Four Tops, and Marvin Gaye?