A big yard sale in Orrington this weekend is helping preserve Maine’s farming history. The Curran Homestead, which is a living farm museum, is hosting the sale. It started Friday and runs, again, on Saturday from 8 a.m. to 2 p.m. This is the first time the Homestead has put on a yard sale. Organizers say they got a lot of office supplies donated from the Girl Scouts and the March of Dimes when both organizations closed their offices in Brewer. Museum Director Robert Schmick says money made off the sale will help maintain the buildings that house historical farm tools and equipment. “We’re constantly raising money to put roofs on buildings and repair things. It’s an never-ending task to keep these buildings from leaking and deteriorating.”On Sunday, after the yard salers have come and gone, the Homestead will host an Open Farm Day. Visitors can stop for free from 10 a.m. to 2 p.m.Some of the activities include blacksmithing demonstrations, farm animals petting zoo and hay rides.