Giant dove puppets made from bed sheets were lofted high by youth brandishing them as signs of peace at this Sunday’s Roots & Shoots International Day of Peace event at the Oakland Zoo. The doves, held together by wooden poles and duct tape, their large eyes outlined with acrylic paint, looked down over the meadow as hundreds of attendees turned the ninth annual celebration into a day-long festival engaging youth in educational arts and crafts activities, like making piñatas for the primates at the zoo.