The Mad. Sq. Eats pop-up food market has reopened in the Flatiron District, and it’ll stay through May 28. This year’s new vendors include Paella Shack by Barraca, Uma Temakeria, and Bombay Sandwich Co., and veterans such as Red Hook Lobster Pound, Roberta’s, and Momofuku Milk Bar will return. It’s open every day from 11 a.m. to 9 p.m.