12:30-2:00 p.m., Edward Ifft, Georgetown University, "Implementing the New START Treaty." Vienna Center for Disarmament and Non-Proliferation (VCDNP), VCDNP Conference Room, Donau-City-Strasse 6, Andromeda Tower, Floor 13/1, Vienna. RSVP online.
President Obama attends a G-20 summit. Hangzhou, China.
Labor Day (holiday).
House and Senate reconvene from their August recess.
~10:30 a.m., President Obama addresses the U.N. General Assembly. United Nations. Broadcast on CNN, webcast on the U.N. website and may be webcast on the White House website.
10:30 a.m.-3:30 p.m., retired Gen. Robert Kehler, former Commander, U.S. Strategic Command; retired Gen. James Kowalski, former Vice Commander, U.S. Strategic Command; and other speakers TBA, "The Enduring Requirements of Deterrence: Transition to a New Administration" Sponsored by Minot (ND) Task Force 21. At the Capitol Hill Club, 300 First St. SE, Washington. RSVP online.
Missile Defense Agency, intercept flight test (FTG-15) of the Ground-Based Midcourse (GMD) missile defense system. Vandenberg Air Force Base, Lompoc, CA, and Reagan Test Site, Marshall Islands. This is the first GMD intercept test since June 2014.
6:00-9:00 p.m., Thomas Pickering, former Undersecretary of State for Political Affairs; and Richard Somerville, Scripps Institution of Oceanography, "Bulletin of Atomic Scientists Annual Dinner." Chicago Cultural Center, 78 E. Washington St., Chicago.