This Sunday, eat brunch at one Chicago spot out to prove that you can still catch disco fever.

At the beginning of every month, the staff of Ann Sather restaurant spends five days transforming the cozy Lakeview breakfast nook, just off the Red Line’s Addison stop, into an oasis of 1970s nostalgia.

Mike Midgette, 42, the manager at Ann Sather, plasters nearly every inch of the Swedish restaurant’s graffiti-painted walls with posters and signs reminiscent of ’70s pop culture. Gold fringe adorns the windows, while star cutouts, records and a mirrored disco ball hang from the ceiling.

It all leads up to the first Sunday of the month, when hungry Chicagoans turn out for “Disco Brunch,” Ann Sather’s tribute to all things boogie.

“I love Disco Brunch,” says Stephanie Howell, 38, a regular who lives around the corner from the restaurant’s Broadway Café location (the other three Ann Sather locations don’t do Disco Brunch). “I love the atmosphere, the iconic faces of the disco era, and the music.”

Howell isn’t alone. The brunch, started almost two years ago, has become a tradition for many. Midgette estimates that about a thousand people come through the door at 3411 N. Broadway St. between 7 a.m. and 4 p.m. for a typical Disco Brunch.

Midgette says the idea came from living through the disco era and knowing that the music would draw people of all ages.

“It’s fun music,” Midgette says. “It appeals to everyone, from toddlers up to seniors.”

When Ann Sather held their first Disco Brunch in December 2005, “it just seemed right,” Midgette says, and since then, Disco Brunch sales have been steadily increasing. Many customers return every month just for the event, and some even wait to celebrate their birthdays or anniversaries on a Disco Brunch Sunday.

“It kind of breaks the monotony of just coming to brunch,” says David Torres, 34, an Edgewater resident who attended October’s brunch. “I think they should do it more often.”

Restaurant-goers dine to classics such as Gloria Gaynor’s “I Will Survive” and Patti LaBelle’s “Lady Marmalade.” Even menu specials are part of the act: In October, the restaurant offered the disco inferno omelet, the Y.M.C. Eggwich and the jive turkey wrap, in addition to its sinfully gooey cinnamon rolls and other fare.

Waiters wear garish silk shirts, provided by Midgette. And customers often don their disco threads, too: Both Howell and Midgette say they’ve seen customers strut their stuff in elaborate get-ups.

“We’ve had four or five tables get up and start dancing at the same time,” Midgette says. “It was a lot of fun.”