大下講師、平和首長会議が主催する第11回NPT再検討会議サイドイベント「平和首長会議ユースフォーラム」（参加者：平和首長会議ユース、ナガサキ・ユース代表団、各国で平和活動に取り組む若者たち）でファシリテーターを務める（於：米国・国連本部）
Lecturer Oshita serves as a facilitator at the Mayors for Peace Youth Forum (participants include the Mayors for Peace Youth, the Nagasaki Youth Delegation, and youth engaged in peace activities from various countries), a side event of the 11th NPT Review Conference, held at the United Nations Headquarters, New York.