ummer is here and there are a lot of great opportunities for people to gather and enjoy themselves. Public health authorities are working together with event organisers and civil society organisations to reach out to people attending events, including at-risk groups, about monkeypox in Europe. This toolkit, jointly created by the World Health Organization (WHO) Regional Office for Europe and the European Centre for Disease Prevention and Control (ECDC), provides them with customisable tools on monkeypox for mass gatherings, both for consideration and use.