1. Roc 190-A Duane St., at Greenwich St.; 212-625-3333Costume party (come as your favorite Broadway-show character) and Italian Carnevale specials. 2. Savoy 70 Prince St., at Crosby St.; 212-219-8570Choucroute dinner on the 22nd, special porkcentric menu the 23rd through the 27th, and an Ossabaw Black Pig feast on Mardi Gras. 3. Jacques-Imo’s NYC366 Columbus Ave., at 77th St.; 212-799-0150Nawlins-style, with gumbo, crawfish-by-the-pound, a brass band, and, yes, beads.