You must kill Moroes in order for Barnes to open up the Opera Event. He otherwise says:
"About time the guild sent some new blood our way! Too bad you came all this way for nothing. We're not allowed to put on a show for our guests, can you believe it? Moroes has forbidden us from starting a new show, and my backers are going nuts! Something needs to be done about Moroes."
After you kill Moroes, he grants access to the Opera Event and you get to fight either The Wizard of Oz, Red Riding Hood, or Romulo and Julianne boss events.
So it seems that even the ghost are ready to rebel against the other bosses...
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