(Patty Kruszewski/Henrico Citizen) Mondelēz International celebrated the 50th anniversary of its Richmond Biscuit Manufacturing Plant Oct. 14. The plant on Laburnum Avenue in Eastern Henrico, produces such snack favorites as Oreo, Chips Ahoy! and Nilla Wafers cookies and Ritz and Wheat Thins crackers. Family members of the plant's 650 employees braved rainy weather and mud puddles for the festivities on the grounds of