The Harvard Square Business Association held its First Annual Urban-Agricultural Fair at Winthrop Park in Cambridge yesterday, in an effort to celebrate locally-grown Cambridge produce and goods. The grassy area located in front of Peet’s Coffee Shop dates back to 1635 and was the location of the first marketplace in Newtowne, the city that predated Cambridge. The event, which lasted from 11 a.m. to 5 p.m., featured cooking demonstrations, recipe sampling, and advising information and drew over 30 participating vendors and organizations.