Conversation so far:
Did Janis Joplin preform at WoodStock?
Janis Joplin appeared at Woodstock starting at approximately 2:00 a.m., on Sunday, August 17, 1969.
Was Janis Joplin performance at woodstock a success?
Janis Joplin wasn't at her best, due to the long delay, and to the amount of booze and heroin she'd consumed. But even Janis on an off-night was incredible.

Question: Why did she blame Caserta for her performance?
Self-contained rewrite: Why did Janis Joplin blame peggy Caserta for her performance at woodstock?