Cincinnati — American Girl unveiled two new in-store experiences this month in its New York City flagship store on Rockefeller Plaza. Award-winning retail design firm FRCH NELSON partnered with the brand to envision both experiences that will be open throughout the holiday season. Girls can now experience a day in the life of one of American Girl’s most popular dolls, Julie. The pop-up called “Julie’s Groovy World” immerses guests in her 1970s world. The in-store activation encourages interactive play between girl and doll and brings Julie’s message of girl empowerment …