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Have DDOT considered something like Qwick Kurb? It would be low-profile for the Fine Arts folks, navigable for emergency vehicles, potentially removable for the inauguration folks, and (hopefully) uncomfortable enough for drivers to deter U-turns. I believe I've seen it used somewhere else in the city - maybe at the 15th/NH intersection.
2 years ago on Pennsylvania Ave. Bike Facilities to Disappear During Pre-Inauguration Resurfacing