Hundreds of city revelers were caught overnight attending two illegal bashes that flaunted COVID-19 restrictions — including one massive gathering with infants present, authorities said Sunday. 

The New York City Sheriff’s Office said about 70 people were first seen going into the side entrance of a building at 2368 Westchester Ave. in The Bronx around 11 p.m. Saturday.

When deputies entered the location about 30 minutes later, they found 400 patrons inside “consuming alcohol, not wearing masks, and unable to social distance,” according to an e-mail from Sheriff John Fucito’s office. 

“Deputies also observed some adults with young children and infants inside the location,” the e-mail says. 

The location and event didn’t have a required New York State Liquor License, according to the e-mail.  

Rodriguez-Shinin Juan, who was identified as the host, was busted for violating state and local measures. Evas Vimas Wilmer Efrain, who was identified as the event’s deejay, was slapped with the same violations. 

The department also raided a gathering of about 225 people at 78-14 Roosevelt Avenue in Queens around the same time, authorities said.

Deputies observed patrons enter the location from a side entrance on 78th Street at around 11:30 p.m. The deputies got inside the establishment about 15 minutes later and saw more than 225 patrons “consuming alcohol, smoking Hookah, not wearing masks, or social distancing inside,” officials said. 

The location also didn’t have a liquor license. 

Felix Zeferino and Roque Jimenez, who were both identified as deejays at it, were slapped with violations of pandemic rules. 

Enrique Alvarado Deloya, who was described as security, was hit with the same violations.