Carla Perlo is twirling a ribbon and dancing around a formerly vacant alley off 8th and Kearny Streets NE. Right off the sidewalk, one of those flailing inflatable tube men flaps over itself in the wind. A steady stream of local officials, artists, and community residents are filing into the alley and a ground level dance studio in the Brookland Artspace Lofts, to celebrate the groundbreaking of what will officially be known as the 8th Street Arts Park.