LEWISTON — Organizers of Lewiston/Auburn’s World Refugee Day have postponed the celebration scheduled for Wednesday in Lewiston. A post on the event’s Facebook page said the decision was made “in light of recent events in Lewiston and in order to allow the community time to grieve the loss of these two community members, Rayan Issa and Donald Giusti.” Rayan, a 13-year-old Lewiston Middle School student, drowned last week during a school field trip to Range Pond in Poland Spring.