Yardley by foot
Take a guided walking tour of downtown Yardley with Susan Taylor, Yardley Historical Association president. Taylor will look at how structures and properties have been used over the years for commerce. $5. Tour starts at the Old Library by Lake Afton, 46 W. Afton Ave., Yardley. 2 p.m. 215-493-6625.
Party for a cause
The Newtown Athletic Club hosts "Go, Dana! Family Fun Night," a party benefiting 10-year-old leukemia patient Dana Demsko. The night includes swimming, crafts and competition for all ages. $40 per family; reservations suggested. 209 Penns Trail, Newtown. 7 to 10 p.m. 215-968-0600, Ext. 12.
A giant yard sale, food court and children's activities are part of the Lutheran Church of God's Love Fun Fair. Proceeds will fund a planned rebuilding trip to a New Orleans partner congregation. Free. 791 Newtown-Yardley Rd., Newtown. 10 a.m. to 2 p.m. 215-968-4335.
It's Folk Fest time again at the Mercer Museum. Roam the grounds watching skilled and costumed artisans demonstrating 17th- and 18th-century crafting. $8; $6 children. 84 S. Pine St., Doylestown. 10 a.m. to 5 p.m. Saturday and next Sunday. www.mercermuseum.org; 215-345-0210.