| March 30-April 15 | House of Representatives spring recess |
| March 31-April 9 | Senate spring recess |
| Week of April 2 | New Mexico Governor and Democratic presidential candidate Bill Richardson travels to North Korea (tentative) |
| April 4 | Deadline for comments on the Energy Department's Global Nuclear Energy Partnership PEIS (Programmatic Environmental Impact Statement). Comments can be submitted by email to GNEP-PEIS@nuclear.energy.gov. |
| April 9-27 | UN Disarmament Commission annual meeting. United Nations |
| April 10 | Noon-1:30 p.m., Stephen Schneider, Stanford University, "Nuclear Winter Revisited." Stanford University, Encina Hall, 616 Serra St., Second Floor, Stanford, CA |
| April 11 | 9:30 a.m., Senate Armed Services Subcommittee on Emerging Threats and Capabilities, hearing on nuclear nonproliferation programs, with former Sen. Sam Nunn (GA); Sen. Richard Lugar (IN); William Tobey, Deputy Administrator for Defense Nuclear Nonproliferation, National Nuclear Security Administration; and Joseph Benkert, Principal Deputy Assistant Secretary of Defense for Global Security Affairs. 232A Russell Senate Office Building, Washington. Webcast on CapitolHearings.org. |
| April 11 | 3:00 p.m., Senate Armed Services Subcommittee on Strategic Forces, hearing on ballistic missile defense programs, with Lt. Gen. Henry Obering, Missile Defense Agency; Lt. Gen. Kevin Campbell, U.S. Army Space and Missile Defense Command; Charles McQueary, Operational Test and Evaluation, Defense Department; Paul Francis, Acquisition and Sourcing Management, Defense Department; and Brian Green, Deputy Assistant Secretary of Defense for Strategic Capabilities. 232A Russell Senate Office Building, Washington. Webcast on CapitolHearings.org. |
| April 14 | Deadline for North Korea to close its Yongbyon nuclear facility under the recent six-party agreement |
| April 16-20 | Nuclear Suppliers Group plenary meeting. Cape Town, South Africa. The U.S.-India nuclear cooperation agreement is not on the formal agenda. |
| Week of April 16 | House-Senate conference committee begins on the budget resolution, H.Con.Res 99 and S.Con.Res. 21. |
| Week of April 16 | House-Senate conference committee begins on the supplemental appropriations bill, H.R. 1591. |
| April 17 | Time TBA, Energy Department holds a public meeting on glassification of surplus plutonium at the Savannah River Site. Location TBA, Aiken, SC |
| April 19 | 8:00-9:00 a.m., Sen. Jon Kyl (AZ), "Space, Nuclear Deterrence, and Missile Defense." Sponsored by NDU Foundation. Capitol Hill Club, 300 First St., S.E., Washington. RSVP to Elma Rhue by email. |
| April 19 | Time TBA, Energy Department holds a public meeting on glassification of surplus plutonium at the Savannah River Site. Location TBA, Columbia, SC |
| April 19 | NATO and Russia discuss the U.S. proposal to develop a missile defense system in Europe. Brussels, Belgium |
| April 21 | 8:30 a.m.-5:30 p.m., Multiple speakers, Think Outside the Bomb youth conference. American University, Kay Chapel, 4400 Massachusetts Ave. N.W., Washington |
| April 22 | Earth Day |
| April 22 | French presidential election, first round |
| April 22-25 | Alliance for Nuclear Accountability, DC Days. Washington |
| Week of April 23 | House Armed Services Subcommittee on Strategic Forces, markup of its portion of the defense authorization bill, H.R. 1585, which includes the nuclear weapons programs of the Energy Department (tentative) |