More than $60 million and tens of thousands of hours of labor have been poured into building the arena.

In a ruling on Friday, Judge Amit P. Mehta wrote that the lawsuit arrived last minute and failed to show how the event irreversibly harmed the individuals who sued.

© Doug Mills/The New York Times

The inquiry comes after a report that Dr. Neal ElAttrache, the physician for the team, supported the U.F.C. star Conor McGregor in using performance-enhancing drugs while recovering from an injury.

© The Yomiuri Shimbun, via Associated Press Images

The towering claw will be the site of an Ultimate Fighting Championship cage match on Sunday, which is President Trump’s 80th birthday.

© Haiyun Jiang/The New York Times

McGregor, the Ultimate Fighting Championship’s main attraction, had the support of the prominent sports physician Neal ElAttrache when he decided to use performance-enhancing drugs.

© John Locher/Associated Press