The Pennsylvania Society was formed in 1899 to help New York-based business barons maintain political and social contacts in Pennsylvania, where their interests - mainly coal, oil, steel, railroads, and merchandise - were located. Among the names dotting the early event programs were Mellon, Carnegie, Wanamaker, and Strawbridge.

These days, it's a dizzying array of dress-up parties, fund-raisers, and galas - anchored by the Pennsylvania Society dinner on Saturday at the Waldorf.

Through the weekend, reporters from the Inquirer and Daily News will be livetweeting at various events.