OTTAWA — Tractor Supply Co. will be holding a grand opening celebration and ribbon cutting today at its newest store. The local boy scout troop will be holding a cookout during the celebration, said Ashley Bostleman, Ottawa store manager. The 4-H club will also have a petting zoo set up, she said. “They haven’t decided what animals they’ll be bringing,” Bostleman said. Through Sunday, all items in the Ottawa Tractor Supply store will be 10 percent off.