The DC region’s largest, free family festival has it all: Real fun. Real tools. Real skills for the future. Dive into KID City, where kids and families will build a city of the future from the ground up. Experiment with different tools and materials, build new skills from coding to design engineering and help a city rise through this unique communal project. Exhibits, demos and live performances inspire kids and adults alike. FutureFest is on Sept. 15, noon to 5 p.m., at Veterans Plaza and the Silver Spring Civic Center, One Veterans Place, Silver Spring MD. kid-museum.org/futurefest.