Similar to selective memory. Caused by either the death of a celebrity or the launch of someone into celebrity status.
This is a trait commonly found in hipsters. It is widely proliferated by the media and their lack of real news.
Celebrective memory in death
Whitney Houston premortem: "haha Whitney and bobby are probably doing crack or heroine. What a waste."
Whitney Houston postmortem: "omg. There will never be another Whitney. Her music touched me so much."
Celebrective memory in stardom
Jeremy Lin prestardom: "wtf who's that Asian guy on the warriors?"
Jeremy Lin poststardom: " honestly, Lin is already on the level of Kobe and wade. You could tell he had something all along, but he just let it loose."