Mass gathering events occur frequently across Australia. The preparation of a mass gathering event from an emergency healthcare service perspective is conducted with limited evidence to support decision-making. Using routinely collected tourism, health, and meteorological data, this research aims to determine the impact on ambulance and emergency department services in the vicinity of 750 planned mass gathering events over a five year period (2015 – 2019). The expected outcome includes an enhanced ability to predict the required emergency healthcare services for a mass gathering event, therefore enhancing the planning and response, benefiting MGE attendees and the MGE host community.