After mentioning that "it was run by Aaron Russo," who later became Bette Midler's manager, he then reveals that "We generally did psychedelics on a Saturday, but I do not remember for sure if that was true this night, but chances are it was."
Aaron Russo, who later managed Bette Midler, was involved in organizing psychedelic use on Saturdays. However, the speaker is uncertain about whether this occurred on this particular evening, and it's possible that it did happen.