The Generic All-Hazards Risk Assessment and Planning Tool for Mass Gathering Events (“All-Hazards MG RA Tool”) aims to support Member States and mass gathering events organizers. The tool is based on the principles of the World Health Organization’s Strategic Toolkit for Assessing Risk (STAR) as well as lessons learned identified from the COVID-19 Risk Assessment Tool for Mass Gatherings. The purpose of the All-Hazards Mass Gatherings Risk Assessment tool is to identify hazards related to the event, assess and quantify the overall level of risk, identify and account for precautionary measures that may reduce the risk, making the event safer. The tool provides a systematic evidence-based approach to identifying and classifying priority risks; a description of the level of national preparedness and readiness to mitigate specific hazards; guidance on the implementation of a comprehensive and strategic risk assessment to inform preparedness and response plans ahead of the mass gathering; and an estimated assessment of the host country capacity to identify and respond to potential negative health impacts.