I want to know the answer to the following question:
When did Pietro Gasparri summon him to the Vatican?
All the background I'm provided with is that "In February 1925, the Cardinal Secretary of State Pietro Gasparri summoned him to the Vatican and informed him of Pope Pius XI's decision to appoint him as the Apostolic Visitor to Bulgaria (1925–35).". Is that enough to answer the question?
Answer: yes