Actually, on April 18th, during the second Dinner seating, an announcement came, over the PA: "Code Bravo, Code Bravo, Code Bravo", followed by "Control group to muster". That left many of us rather uneasy, though the people at mine and Jason's table agreed we'd wait for further word or instructions (we did notice that others "made a hasty exit from the Britannia").
We noted that the Code was for a fire alarm, so we were rather anxious. Fortunately, things were taken care of, so the alert was soon ended.
We were notified that it was a fire in a crew member's cabin, and was able to be controlled.
I'd like to think that if a fire had occurred, at the same time, in my cabin, similar actions would have been performed to control the situation.