Luca Luca celebrated the 10th birthday of its store on Madison Avenue at 62nd Street Thursday with a champagne bash where dozens of patrons dressed in Luca Luca, past or present. “When we opened here in the Nineties, everything shown on Madison Avenue was black,” recalled Luca Orlandi, Luca Luca’s designer and owner. His collection stood out with its vibrant fabric and color stories, but wasn’t an immediate smash. “Customers, over the years, slowly, slowly bought one piece, then another. Now they buy only Luca Luca. I believe it, because their husbands tell me.” … Tuesday, Dana Buchman was honored at the 29th Annual National Center for Learning Disabilities benefit dinner at the Marriott Marquis hotel in Manhattan. “Being in fashion, I’ve had dreams of being honored for many things, [but] I never thought I would be honored for this,” said Buchman upon acceptance of her children’s advocacy award. Paul Charron, chairman and chief executive officer of her parent company, Liz Claiborne Inc., dashed in for a quick moment to present her with the honor, along with longtime friend and Marc by Marc Jacobs president Carolyn Risoli. Buchman’s oldest daughter, Charlotte Farber, also stepped up to say a few words about her mother, calling her the “best mom in the world.” … That night, an ever-elegant Carolina Herrera hosted cocktails in her Madison Avenue store to toast the gala committees for the organization Casita Maria’s Fiesta 2006. Joanne de Guardiola, Debbie Bancroft, Bob Colacello and Dennis Basso swilled champagne as their hostess looked on. “It’s always nice to do something for charity,” she offered.