The OIDP holds an annually International Conference to discuss and reflect on the state of participatory democracy in the world. The Conference is organized by the city that holds the presidency of the organization, and defines the issues according to their priorities in this area. The conference brings together local, regional and nationals politicians, facilitator, academics and political activists. These seminars consist of lectures, panel discussions around specific issues, parallel exchange sessions and multiple parallel meetings between participants.

The OIDP Conference is a gathering of experts in the field of participation and political leaders who advocate a more participative local democracy. It is also an opportunity to promote cooperation between cities and international organizations in the field of democratic innovations.

In the framework of the Conference, the OIDP Assembly members is held.