Jeremy Dibble seems to think it was performed by the St. Cecilia Society in 1913 and then in Philadelphia by Horatio Parker. Is this doubtful?
There certainly seems to be some doubt: in the narrative text of his biography of Stanford, Dibble does indeed allude to these performances, but in his accompanying catalogue he marks the work as "unperformed?" - apparently no programmes or reviews have come to light. In the introduction to the 2011 broadcast he discussed having to edit the orchestral score since it appeared to have no performance markings. Paul Rodmell simply leaves the performance column in his catalogue blank ...
???