You have been cited under § 5.02 of the Public Courtesy Code: Conversation During a Support Act
SOMEBODY WORKED ON THAT.
Someone is on that stage playing to a room that is loudly discussing something else. They loaded in at four. They are being paid in exposure and drink tickets. You do not have to love it — you do have to let the people who came early hear it.
This is not a fine. There is no fine. Think about what you did.