Please join the Somerville Historic Preservation Commission (SHPC) for a Union Square Walking Tour, “Union Square: An Intermixing of Industry, Immigration and Innovation,” on Sunday, September 21 2 to 4:30 p.m. The tour is free, and will step off from Somerville High School, 91 Highland Ave. It will include interior tours of the historic St. Anthony’s Church and the new Greentown Labs, and will end with a reception at Machu Picchu Restaurant. This event is sponsored by SHPC and ArtsUnion. A rain date has been set for Sunday, Sept. 28. For more information, contact Brandon Wilson via firstname.lastname@example.org or 617-625-6600 ext. 2532.