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Clover Food Lab opens its 24-hour restaurant April 22, the small chain said in a press release today.

The new Clover restaurant – the sixth – will feature a late-night menu beginning at midnight that combines elements of breakfast and some new items, said founder Ayr Muir in an email.

The name, CloverHFI, is a nod to the location’s previous tenant and longtime haunt for people getting out shows at nearby clubs, Hi-Fi Pizza, and Muir said bands will eat free upon presentation of a playbill showing they played the Middle East nightclub that night.

“I’ve always loved 24-hour restaurants,” Muir said. “And Central Square is my favorite neighborhood in Cambridge. Customers have been begging us for years to open in Central, and we’re thrilled to be bringing our food here.”

Hi-Fi Pizza stayed open until 3 a.m. Thursdays through Saturdays until its ouster in March 2014, after more than 45 years at the location across from the Middle East. The new Clover will be the city’s only legitimate 24-hour sit-down dining option.

Clover started as a food truck at MIT in 2008 and now operates a fleet of seven food trucks alongside five restaurants in Cambridge, Boston, Brookline and Burlington.

On April 22, Clover will host a Free Sandwich Day, where customers can pay what they’d like for food. All proceeds will be donated to a food-focused cause, the press release said.

The new restaurant, designed by architects John Hong and Jinhee Park of Single Speed Design with construction being completed by Justin Kelly Contracting, will have pinball machines, a communal table, CSA pickup area and a retail area featuring grab-and-go food. It’s at 496 Massachusetts Ave, Central Square.

This post took significant amounts of material from a press release.