1. 550 Seventh Ave.
One-stop shopping for pre-event gown borrowing, as every floor of this fashion-district office building houses a major American designer, from Oscar to Ralph to Donna.
2. Café Sabarsky
1048 Fifth Ave.
Go for an apple strudel at the Viennese café on the parlor floor of the Neue Galerie, founded by Ron Lauder, original “It” girl Aerin Lauder’s dad.
1577 Second Ave.
They have only two flavors (plain or green tea) and a nationally publicized mice-infestation problem. But still the girls line up, even in the rain, for a fix of this suspiciously fluffy fro-yo.
1007 Lexington Ave.
The reincarnation of Mortimer’s, the original social X-ray spot where grandes dames like Nan Kempner and Pat Buckley went to not eat.
5. Amy’s Fashion
209 E. 66th St.
This couture tailor takes just two weeks to carefully alter the gown you bought—shhh!—at the Vera Wang sample sale.
6. Mrs. Astor’s Ballroom
350 Fifth Ave.
Virtually no one who visits the Empire State Building in hopes of seeing giant gorillas on its spire knows that 100 years ago, Mrs. Astor’s famous ballroom occupied the same site.
7. Ashley Javier Parlor
250 Fifth Ave., Penthouse 1212
His stark black-on-white atelier is one of the most beautiful salons in town, but the real A-list—Jemma Kidd, Zani Gugelmann, Byrdie Bell —never set foot inside: Ashley makes house calls.
241 W. 14th St.
Started by the guys behind a Citizens Arts Club in London, this private arts club in an antique townhouse is likely to become the new Soho House when it debuts next month.
9. The Garden of Ono
18 Ninth Ave.
The May-to-October garden caters to carb watchers who come to see and be seen and gorge themselves on the “riceless” roll menu.
10. Beatrice Inn
285 W. 12th St.
Owned by Paul Sevigny, brother to downtown icon Chloë. The place to end up on weeknights (especially Thursdays) after drinks at the Gramercy’s Rose Bar and cabaret at the Box.
11. Housing Works
245 W. 10th St.
The girls-in-the-know, go-to spot for vintage finds.
505 West St.
The Cuban-themed lounge—picture forties Havana with a view of the Hudson—helmed by Armin Amiri, the legendary Bungalow 8 doorman.
13. Sant Ambroeus
259 W. 4th St.
Nurse a mousse-thick cappuccino at the bar and watch Tinsley Mortimer text Fabiola Beracasa on her BlackBerry and dapper Fiat heir Lapo Elkann talk soccer with the waiters.
14. Brown Café
61 Hester St.
One-third of the Green Brown Orange café-caterer conglomerate. Very small, very lovely, very laid-back: the new Café Gitane.
15. Smith and Mills
71 N. Moore St.
Owned by some of the folks behind the Beatrice Inn and Employees Only, this closet-size restaurant has no sign and only takes cash, which weeds out the beer-swilling Wall Street crowd.