Acera School will host its Spring Innovator Symposium on April 20, 6:30-8:30PM on its campus (5 Lowell Avenue in Winchester).  It’s free and open to the public of all ages.  Meet scientists, researchers, tinkerers, and entrepreneurs from MIT’s Media Lab, Harvard’s School Applied Engineering, BU’s Social Development & Learning Lab, and more. Activities include:  Robotic Creations, Programmable Tattoos, Woodworking Challenge, Engineering Challenge, Shadow Architecture, and Drawing in Virtual Reality.