Conversation so far:
When did Andy Warhol die?
Warhol died in Manhattan at 6:32 a.m. on February 22, 1987 at age 58.
Cause of Andy Warhol's death?
According to news reports, he had been making a good recovery from gallbladder surgery at New York Hospital before dying in his sleep from a sudden post-operative irregular heartbeat.

Question: When was his funeral?
Self-contained rewrite: When was Andy Warhol's funeral?