No one was injured in both the incidents and work was underway to put the structures back in place, he said.
"The (VVIP) entry gate collapsed when fabrication work was going on. It was not a major incident. No one was injured in the incident," said Special Commissioner of Police, Crime Branch, Ajay Tomar said.
President Trump and Prime Minister Narendra Modi will participate in a roadshow here on Monday and later address the 'Namaste Trump' event at the Sardar Patel Stadium in Motera area where over one lakh people are expected to be present.
The stadium has already received 'Building Use' permission from the Ahmedabad Municipal Corporation, an official earlier said.
It is the world's largest stadium with a capacity to accommodate 1.10 lakh spectators.
The stadium has been rebuilt after demolishing the old one which had a seating capacity of 49,000 spectators.