PORTLAND — Cardinal Antoine Kambanda, Archbishop of the Archdiocese of Kigali, Rwanda, will celebrate a special Mass on Friday, June 17 at 5:30 p.m. at the Cathedral of the Immaculate Conception on 307 Congress Street in Portland. A reception will follow in the Cathedral’s Guild Hall. Cardinal Kambanda is a native of Nyamata, Rwanda, where the Nyamata Genocide Memorial stands to mark the Rwandan genocide of 1994.