How can a city activate empty storefronts, abandoned lots or even cultural institutions? DC Office of Planning Director Harriet Tregoning, RTKL architect and 24 Hour City participant Kashuo Bennett, and Christine Ewing, Regional Fine Arts Officer at the U.S. General Services Administration share ideas on how to encourage commerce, memorialization and design in fleeting but powerful ways. 1.5 LU (AIA)FREE. Prepaid registration required at www.nbm.org. Walk in registration based on availability.