Artificial mediators are a promising approach to support group conversations, but at present, their abilities are limited by insufficient progress in group behaviour sensing and analysis. The MultiMediate challenge is designed to work towards the vision of effective artificial mediators by facilitating and measuring progress on key group behaviour sensing and analysis tasks. This year, the challenge focuses on the recognition of bodily behaviours as well as on engagement estimation. In addition, we continue to accept submissions to previous years’ tasks, including bakchannel detection, agreement estimation, eye contact detection, and next speaker prediction.