President Trump’s September 2026 schedule centers on a confirmed bilateral meeting with Irish Taoiseach Micheál Martin on September 12–13 during an official trip that also includes a U.S. Embassy sod-turning ceremony and events with business leaders. Traders assign high probabilities to additional in-person encounters with Xi Jinping and Volodymyr Zelenskyy because the United Nations General Assembly in New York on September 22 typically generates numerous bilateral side meetings, consistent with patterns from prior multilateral summits. Domestic stops, including the Republican National Convention in Dallas on September 9–10 and the Pentagon 9/11 commemoration, shape expectations around party figures and administration officials. Resolution hinges on verifiable reporting of any direct interactions between September 1 and 30.