Banners were displayed prominently on Washington Square Thursday night for the annual Celebrate Washington event that will be held downtown Saturday. The event kicks off at 8 a.m. with the Flying Pigs Duathalon. Kids activities and an art show begin at 10 a.m. in Central Park. A street 3-on-3 basketball tournament will be held. Musicians will perform on the square throughout the day. The streets around the square will be closed from 9 p.m. Friday to 2 a.m. Sunday.