SUNDAY, watch the “Mad Men” Season 3 premier on the Jumbotron in Times Square; show up early for an 8 p.m. costume contest.

Thirsting to drink like the functioning alcoholics of “Mad Men’? Bars the Hilton hotels on Sixth Avenue and on Church Street offer old-fashioned cocktails.

Other spots are hosting full-on costume parties, like at The Gates in Chelsea tomorrow night. The invitation calls for “1960s” attire, and the retro club looks like the kind of place Don Draper might meet a “lady friend.” Having trouble pulling it all together? Rothman’s in Union Square is offering a “cash for clunkers” deal. Men can bring their tired suits and get a $100 credit on a sharp new look.