The Nauvoo and British Pageants are spectacular. I love watching them whenever I can. The missionaries get to go up and sing "Called to Serve" with the cast at the end of the British Pageant. I'm on the second row left end.
All the Quorum of the Twelve were sent as a body to preach the gospel in the British Isles. There were thousands of converts who then came to America to help build the temple in Nauvoo. The impact they had on the Church is amazing!