ONTARIO — A story rooted in Hiroshima and nurtured in communities across Oregon will return to Ontario this month when Four Rivers Cultural Center and Museum screens “The Seeds of Peace.” The 67-minute documentary will be shown Saturday, July 18, in the Meyer McLean Performing Arts Theatre at Four Rivers Cultural Center, 676 SW Fifth Ave. The screening will kick off the center’s Obon Festival, with the remaining festivities following the film.