From the city's website:
Visit the City’s 19th century burial grounds! This ghostly gathering treats visitors on a guided tour of the gravesites open during Somerstreets/Monster Mash Festival. At each site a Ghost will engage in a conversation about their lives in centuries past. A wonderful way to learn Somerville history from those who lived it! Entry by donation. Meet at Milk RowCemetery, 400 Somerville Avenue, next to DeMoulas’ Market Basket.
For questions, contact bmangum411@aol.com or www.Historicsomerville.org.