What is the fine-grained topic of the following text: Announcement has been made by Alexandra Leigh-Hunt of Sag Harbor, L.I., and Justice Henry Ridgely Horsey of Dover, Del., of the engagement of their daughter, Philippa Ridgely Horsey, to Edward Elliot Biddle, a son of Barbara Noyes of Durham, N.H., and William W. Biddle of Seattle. Only return the topic.
Announcement of Philippa Ridgely Horsey and Edward Elliot Biddle's engagement