I want to know the answer to the following question:
When was the Valencian regional exhibition held?
All the background I'm provided with is that "This production was promoted by the Ateneo Mercantil de Valencia (Mercantile Athenaeum of Valencia), especially by its chairman, Tomás Trénor y Palavicino, and had the support of the Government and the Crown; it was officially inaugurated by King Alfonso XIII himself.". Is that enough to answer the question?
Answer: no