We cruised on Summit, Alaska to LA (repositioning cruise - great value!) 3 years ago. The Cirque had taken over the large panoramic lounge at front of Summit, with tacky "tents", etc. Plus the show was absolutely horrible. Many people (including my wife and I) walked out. I complained to the Cruise Director, and the remaining shows on this cruise were cancelled.
But I heard later that Summit did not remove the decorations.
A horrible experiment by Celebrity.