Union Square Neighbors (USN) in collaboration with Union Square Main Streets (USMS) will hold the second of three neighborhood-organized events entitled The Space in Between: Art, Green Space and the Public Realm, on Thursday, July 31 at 7:30 p.m. USN and USMS have asked members of the creative community in Somerville and around greater Boston to talk about projects that make public spaces delightful for all. Four speakers will give short 8-minute presentations about built work or work in progress followed by a small group discussion. This week’s speakers include: