Cole Buckley, 21, of Braintree, is facing a charge of assault and battery by means of a dangerous weapon.
The incident happened Sunday night at TD Garden after the Celtics lost to the Brooklyn Nets in Game 4 of their first-round playoff series. Buckley was arrested shortly after.
The arraignment was initially supposed to happen to Tuesday, but it got pushed back to Wednesday.
Buckley is facing a possible lifetime ban from TD Garden.
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