For this year’s Junior League of Boston Decorators’ Show House, more than 20 local designers transform 25 rooms in the Nathaniel Allen House, the site of the earliest co-educational school in the country and a stop on the Underground Railroad. From the gracious receiving room by Gerald Pomeroy and cozy bar by Cecilia Walker and Tracey Foley on the first floor, to a nursery done in designer Mally Skok’s own pink and purple prints, plus a preppy, chinoiserie chic-themed bedroom by Elizabeth Benedict on the second floor, there’s a wide range of talent and style on display. The Junior League of Boston 2016 Decorators’ Show House at The Nathaniel Allen House, 35 Webster St., West Newton, bostonshowhouse.org