Conversation so far:
when did Berry die?
March 26, 2004.
what did he die of?
after he suffered a seizure eight days before his 63rd birthday.
where was he buried?
his body was cremated.
why was he cremated?
CANNOTANSWER.
Did they have a wake or viewing for him?
a "Celebration of Life" was held in Berry's memory at the Roxy Theatre on the Sunset Strip in West Hollywood, California.

Question: who attended the celebration of life?
Self-contained rewrite: who attended the celebration of life held in Jan Berry's memory at the Roxy Theatre in Hollywood, California?