The restaurant will serve-up free burgers Sept. 21 between Burger King and McDonald’s on Northside Drive in Home Park.

Burger King August 26 proposed to temporarily join forces with its biggest competitor — McDonald’s — to drive awareness for Peace One Day, September 21.

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The proposal was simple: partner to serve the “McWhopper,” a burger combining the best of each brand’s signature burgers, from a single pop-up restaurant in Atlanta (a location central to both Burger King and McDonald’s headquarters.)

McDonald’s declined the offer.

Burger King September 1 announced it would instead partner with Krystal, Denny’s, Giraffas, and Wayback Burgers, for the charitable event.

What Now Atlanta (WNA) Monday uncovered the Peace One Day pop-up will be situated in the parking lot of Burger King, at 1122 Northside Drive in Home Park, adjacent a McDonald’s in “neutral territory.”

“I’m not sure why corporate picked this location, but it’s going to be crazy,” a manager at the burger joint confirmed with WNA a trip to the location September 7.

Burger King has not officially announced the pop-up location and the packaging, uniforms, and pop-up design will most likely differ from the initial proposal to reflect the new partnerships.

Atlantans will “pay” for their limited edition mash-up burger simply by declaring with whom they’ll “settle the beef with,” putting it to ink on a “tray mat truce.”

In related news, Wayback Burgers is planning an Atlanta location, according to the burger chain’s website. Wayback’s first Georgia outpost is in Savannah, and will soon open its second location in the state in Braselton.

Did Burger King pick the best spot for the Peace One Day pop-up? Leave your thoughts in the comments.