Break out the dancing shoes: This season's party schedule is more packed than ever before.

Take tonight, when there are no fewer than four events happening at the same time. Van Cleef & Arpels is throwing a bash at the Hammerstein Ballroom, Roger Vivier and Tom Ford both celebrate on Madison Avenue and Glamour magazine hosts its annual designer-driven affair downtown.

And the pace doesn't let up from there. Gwen Stefani's pals are dining at the Gramercy Park Hotel on Wednesday, in honor of L.A.M.B., while Tommy Hilfiger shakes up MoMA and Calvin Klein throws its first of two parties, this one to launch Calvin Klein Steel and hosted by Hilary Swank and Djimon Hounsou.

On Thursday, Margherita Missoni and Rachel Zoe host a private dinner followed by drinks at Socialista, Purple Magazine takes over Freemans and Alexander Wang works the night shift, inviting pals to party with him in a space on 37th Street — until 4 a.m. (clearly those people don't have 9 a.m. shows).

Whoever still has the stamina on Friday will head to the Just Cavalli store opening on Fifth Avenue or a raucous show by The Hours at the Prada store downtown.

The weekend is all about milestones, with Ralph Lauren celebrating his 40th anniversary with a lavish black-tie extravaganza for 500 in Central Park on Saturday and Narciso Rodriguez toasting his 10th year in business with a more intimate soiree on the roof of the Gramercy Park Hotel on Sunday. Indie darling Miranda July will also fete Rodarte's Kate and Laura Mulleavy with a dinner at gallery Salon 94 Saturday night.

Marc Jacobs kept his Monday night party slot for friends and family. Everyone else can try Mario Testino's event, hosted by V magazine, for the shutterbug's new book "Lima Peru."

Calvin Klein goes at it again on Tuesday, with a dinner hosted by Julianne Moore and Kate Bosworth in honor of designer Francisco Costa, while Naomi Watts screens her film "Eastern Promises" with the Cinema Society.