Somerville’s annual Santaville event will be held this Saturday, Dec. 13, in downtown Somerville.Allyson Hargrove is this year’s event organizer, and invites all to attend.The event has been a Somerville tradition for over two decades since it was initially imagined by longtime Somerville area resident Camilla Godfrey, who started the event 23 years ago to ensure that local ch...