Remove crescent dough from packaging (do not unroll). Cut each tube into eight slices. Arrange in an 11-in. circle on an ungreased 14-in. pizza pan. Bake at 375° for 15-20 minutes or until golden brown. Cool for 5 minutes before carefully removing to a serving platter; cool completely. In a small bowl, beat the cream cheese, sour cream, dill and garlic powder until smooth. Spread over wreath; top with broccoli, celery and red pepper. Form a bow garnish with celery leaves.