From the Joint Base Myer-Henderson Hall public affairs office:
Due to impending inclement weather tonight’s Twilight Tattoo will no longer take place on Summerall Field. It is now scheduled to be inside Conmy Hall on Joint Base Myer-Henderson Hall. Unfortunately Conmy Hall only seats approximately 1,000 patrons and admission will be granted on a first-requested, first-seated basis. The U.S. Army Military District of Washington Public Affairs Office will contact groups that have requested admission to inform them of their status. We apologize for the inconvenience.