Celina Mayor Jeff Hazel presents a Celina city flag to Minamiawaji Vice President Shiro Kawano during a tree-planting ceremony in Lakeshore Park. Seven delegates of Minamiawaji, Japan visited Celina to sign a resolution reaffirming their sister city partnership. The delegates will return to Japan today, but the 12 exchange students and three chaperones will continue touring Mercer County through the rest of the week.