On Wednesday, June 21st, Aeronaut Brewing Co. and the Duck Village Stage series host a slideshow and discussion with Charan Devereaux about the economic history of Somerville’s oldest commercial district, Union Square. The discussion will profile some of the Square’s biggest employers beginning in the 1800's, including the meat-packing, glass-blowing, and textile finishing industries. How did the advent of railroads impact the local economy? How does the city’s economic past affect Somerville’s identity today? This free event is sponsored by Mass Humanities.