UWISHUNU: This weekend, the Delaware River Waterfront will transform from an urban riverside into a lush oasis with the grand opening of Spruce Street Harbor Park, the new pop-up park at Spruce Street and Columbus Boulevard. From Friday, June 27 through Sunday, August 31, the Delaware River Waterfront Corporation — the folks that brought us this past winter’s Waterfront Winterfest at the Blue Cross RiverRink — turns the Penn’s Landing Marina at Columbus Boulevard and Spruce Street into a pop-up summertime village. Considerably upgrading the perennial good times of summer on Penn’s Landing, Spruce Street Harbor Park provides a charming new public space that’s free to check out and open to the public daily from 11 a.m. to 1 a.m. MORE