They snuck into the Barclays Center and attacked a bus containing a number of UFC fighters and employees. Two of the criminal mischief charges are felonies.
One of his accomplices, Cian Cowley, had his bail set at £17,500 ($25,000).
McGregor, 29, handed himself into the NYPD in the early of hours of the morning and was promptly charged for his actions.
Ira Judelson, a bail bondsman, said that McGregor, an Irish citizen, would be able to keep his passport.
He said: "McGregor seemed lovely".
At one point, video from inside the bus shows a hand truck smashing through the bus windows, cutting UFC fighter Mike Chiesa's face. "A million security guards had to restrain him". He was also treated at Brooklyn Methodist Hospital.
He has been charged with three counts of assault and one of criminal mischief.
CNN could not reach McGregor's team for comment.
He is due back in court in June.
The bus attack is just one issue clouding Saturday night's events. "Nothing's been 'proven.' I can't speculate on how we're going to treat that situation in the future until I'm presented with the facts at the time".
He was this week stripped of his UFC lightweight belt, which was due to be on the line in a bout between Nurmagomedov and Max Holloway at UFC 223, before the latter dropped out when doctors stopped him cutting further weight on Friday.
However, anyone expecting to grab any of the limelight from McGregor is mistaken.
Customers can receive a refund where they bought their tickets, if they choose, UFC said.
McGregor will face a number of legal, and potentially bout licencing, issues in the United States over the coming months - he is due back in court on June 14 - but it may not prevent him from fighting in Russian Federation. Walden said McGregor is "the most visible face on the planet" and has no criminal history.
The incident led to lightweight Michael Chiesa, 30, receiving several facial cuts, while flyweight Ray Borg, 24, suffered an eye injury. Both fighters have been dropped from their fights this weekend.
"The organization deems today's disruption completely unacceptable and is now working on the consequences that will follow", the UFC said in a statement. It did not provide details on Lobov's role in the incident. The UFC did not elaborate on what that involvement entailed.
Nurmajomedov, who got into a reported hotel scuffle with longtme McGregor training partner Artem Lobov, was on the bus with the other fighters, which caused McGregor' blowup. According to White, when McGregor found out about the altercation, he "loaded the plane full of guys from Ireland, flew over here [to New York], and coordinated the attack on the bus" Nurmagomedov was on.
He took time off to await the birth of his son, Conor Jack, and lost to Floyd Mayweather Jr.in his professional boxing debut last August.
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