Conversation so far:
Did Janis preform at WoodStock?
Joplin appeared at Woodstock starting at approximately 2:00 a.m., on Sunday, August 17, 1969.
Was this performance a success?
Joplin was ultimately unhappy with her performance, however, and blamed Caserta.

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