The Brooklyn Music Society’s Bohemian Festival opens its third day of music to a crowd that basks appreciatively in this suburbia-esque setting, in these last days of summer. The Historic Onderdonk House sets a tone of green, cropped grasses, white picket fences, and drooping hydrangeas, specimens that could have recently enjoyed a grooming by one of the neighborhood soccer moms. We can end our comparison to the American ‘burb here, however, as artsy hippies, bedecked in fairy wings and draped silks swoop and pose around the hydrangeas. A belly dancer, whose attire chimes with every nubile step, entertains the locals in their lawn chairs, while stage hands scuttle over the main stage in preparation for Los Mas Valientes.