The Somerville, MA Open Data Webinar, held on September 20, 2012, featured Mayor Joseph Curtatone and other city officials discussing the city's vision for utilizing open data to enhance service delivery, community engagement, and transparency. The city implemented various initiatives including a 24/7 call center, self-service access to city data, and the Checkbook Explorer for financial transparency. Somerville aims to join the national open data ecosystem by collaborating with other cities like Seattle, New York, and Chicago.