Every five years there is a Review Conference for the Treaty on the Non-Proliferation of Nuclear Weapons (NPT). The next review conference will be in 2020.
The Preparatory Sessions for the Review Conferences are 2-week long meetings of States Parties to the NPT, where the governments deliberate on disarmament and non-proliferation initiatives and prepare the ground for an agenda for the Review Conference.
NGOs also participate as observers at the Preparatory Sessions, organise side-events and make presentations at one of the sessions. NGO participation is facilitated by the UN Office of Disarmament Affairs and Reaching Critical Will.