From March 23 - 29, 34 classic, stalwart New York restaurants, including, Where? Delmonico's, 21 Club , Barbetta, Le Cirque, the latest incarnation of Tavern on the Green and newer restaurants The Gander and Urbo will offer a 2-course lunch for $19.69. Or 2 cocktails for the shameless liquid lunchers. Or both. During Mad Men Dining Week.