Preheat oven to 375 degrees. Unroll crescent dough; separate into 16 triangles. Arrange 8 triangles in a circle on a large Round Stone with Handles with wide ends 3 inches from baking stone.
Arrange 8 remaining triangles in center of baking stone, matching wide ends over seams of triangles where wide ends meet, creating a smooth surface for filling. DO NOT SEAL CENTER TRIANGLES!
Place mayonnaise, mustard and black pepper into a bowl. Chop turkey using a food chopper. Slice celery. Snip parsley using a shears. Add the turkey, celery, parsley, and cranberries to the bowl. Grate cheese into bowl. Mix up the filling.
Using a large scoop, scoop filling over dough in a continuous circle.
Coarsely chop walnuts using food chopper; sprinkle over filling. Beginning with last dough triangle placed in center of baking stone, bring point of triangle straight across filling.
Next.....bring point of opposite OUTSIDE triangle diagonally across filling, covering point of previous triangle. Filling will show.
Repeat, overlapping points of inside and outside triangles to form a wreath. Tuck last end under first.