BOSTON, May 4, 2017 /PRNewswire/ -- On June 15, 2017, City Hall Plaza will again host the fifth annual Boston TechJam, a celebration of the technology ecosystem and culture of New England- and Boston-area entrepreneurs, startups, established tech companies, venture capitalists, non-profit organizations and higher learning institutions. The event is part block party, part tech showcase that connects the community, experiential content and a celebration of the local innovation economy.