Shake Shack is about to get some competition — albeit temporarily. A so-called Mad. Sq. Mark’t will pop up in Madison Square Park from October 9 through November 1 from 11 a.m. till 8 p.m. daily. Among the food vendors: Hill Country, Wafels & Dinges, Breezy Hill Orchard, Ben & Jerry’s, and more. Swedish meatballs and crêpes will also be sold, and we’re told that Fatty Crab and Cabrito will be pouring $8 pints of Fatty Sidestepper Ale, as well as grilling chorizo and al carbon tacos, chicken satay skewers, and Fatty Dogs. To find out about non-food vendors, visit the Madison Square Park Conservatory’s website.