A GOOD CAUSE: Valentino USA is again foregoing its holiday party to instead sponsor New Yorkers for Children’s “Wrap to Rap” event. Just like last year, employees of the fashion house’s U.S. arm will help wrap more than 1,000 gifts for children in foster care. They will have a little help — supporters of the organization, including Rachel Roy and Zac Posen — are expected to join in at the packing party at The Ainsworth next Monday.