A design concept for Phase III of the Dulles South Multipurpose Center will be presented to the public on Wednesday, December 18, at 2 p.m. The concept for the senior center addition is based on public input from two sessions held on December 5, and there will be an opportunity for additional input. The center is located at 24950 Riding Center Dr., South Riding. For more information, call 703-777-0343 or contact prcs@loudoun.gov.