The Historical Society of Cheshire County is celebrating International Leave a Zucchini on Your Neighbor's Porch Day while seeking memorabilia for a new exhibit on the region's quirky zucchini festival history. The Historical Society of Cheshire County is preparing a new exhibit on the International Zucchini Festival and encouraging residents to celebrate Aug. 8 by sharing homegrown zucchini with neighbors. KEENE, N.H. (MyKeeneNow) The Historical Society of Cheshire County is encouraging Monadnock Region residents to embrace one of summer’s quirkiest traditions by celebrating International Leave a Zucchini on Your Neighbor’s Porch Day on Aug. 8. To mark the unofficial holiday, the historical society has created printable gift tags that read, “Someone thought you could use a zucchini. Anyone with memorabilia or questions about contributing to the exhibit can contact the Historical Society of Cheshire County at 352-1895 or by email at hscc@hsccnh.org.