Turning off Memories on Photos
In case anyone is monitoring this from Apple. Memories popped up today on my MacBook. It contained three people who were incredibly important to me, all of whom have died in the last year.
Thank you for sending me into a tailspin of depression, as after reading all of the answers, I apparently can not turn off this incredibly invasive option.
MacBook Pro (Retina, 15-inch, Mid 2014)