Over 150 vendors will be out and about for the 31st annual Adams Morgan Day Festival, organized by the Adams Morgan Main Street Group, in this always-buzzing, diverse neighborhood. New this year: a Green Pavilion at the Marie Reed School field, featuring eco-friendly vendors specializing in organic health and wellness products; a DJ Pavilion; and a Pet Zone with vendors for the domesticated animal set. Live music and dance performances are also on tap. Sunday, Sept. 13, from noon to 7 p.m. 18th Street NW, between Columbia Road and Florida Avenue. Visit www.adamsmorgandayfestival.com.