Not even an event thrown by Mayor Eric Adams is immune from the violence plaguing the Big Apple.

An apparent emotionally disturbed woman got clobbered to the face Saturday by an unidentified man roughly 10 feet away from Adams during a “Car-Free Earth Day” celebration he hosted in the South Bronx.

The woman, who appeared to be in her late 20s to early 30s, started the brouhaha around 1:45 p.m. along Roberto Clemente Plaza on Willis Avenue, according to a video captured by a Post photographer.

She began repeatedly kicking bags of recyclables left along the plaza before opening them and dumping debris while bystanders stared in shock.

A stone-faced 60-something-year-old man, who was wearing sunglasses and a cap, began jawing at her to stop, but she didn’t back down.

Instead, she broke off pieces of pizza she was eating and sassily tossed them at him as he walked away.

The woman then dumped more debris out of one bag, yelling, ‘F–k off my block! What the f–k is up?!” before the man had enough.

He grabbed her shirt with his right hand and clocked her in the face with a wild-left roundhouse punch, dropping her to the pavement as startled onlookers gasped, “Oh!”

Members of the mayor’s security detail and event organizers quickly tried to separate the two.

However, the woman rose from the ground within two seconds and charged at the man screaming, “You want to hit me, n—a!”

She jumped up swinging but failed to land her punches because the man was already being escorted away in the opposite direction by security.

The woman walked away fuming — as a smiling Adams posed for selfies nearby and greeted about 30 supporters.

It’s unclear if Hizzoner heard the initial exchange, but minutes later he asked his security if there was a “uniformed officer” around to help resolve the disagreement after the woman stormed back screaming, “He hit me!” — and demanded a rematch.

The identities of both sluggers could not immediately be confirmed.

No one was arrested.