It's marvellous that you had an evening devoted to the dances of Thomas Bray! Where did this take place and who took part? By the way, I think you must mean "Gloucester" (pronounced "Gloster"), not "Glochester".
True, it is a sad mistake. The dance was dedicated to Prince William, Duke of Gloucester. The event took place in former house of Mathilde Kschessinska in St. Petersburg.
