A later attempt at performing the onstage demonstration succeeded.
A spokeswoman for the Web Summit later said that the initial demonstration did not fail because of wifi but because of "a glitch in Paddy's phone".
Mr Cosgrave said that 3,000 people didn't make it into the 15,000-seater Meo arena, where the conference's main stage is located.
She also has six events planned for June, including a visit to the Arggyll and Sutherland Highlanders at Howe Barracks in Canterbury.
Richard Fitzwilliams, a Royal commentator, said he felt the move was very significant in light of the Queen's personal commitment to the Commonwealth and a sign care was now being taken to balance her workloads.
"The whole discussion on the topic of climate was very difficult, not to say very unsatisfactory," she said.
Why it matters: Although Merkel was referring to their difficult climate conversation, it was clear that Trump was the odd man out during his G7 meetings — and the last leg of his trip suggested he was continuing to be a disrupter in Europe.
K., France, Canada, Trump followed behind in a golf cart as the others walked together along the streets of Italy.