This report presents a comprehensive disaster response plan for a hypothetical terrorist siege at the Art Gallery of NSW in Sydney. The scenario involves a hostage situation with older people and gallery staff. The plan details the roles of relevant stakeholders, including emergency services, hospital caregivers, and utility providers. It emphasizes the need for effective evacuation strategies, resource management, and the establishment of a command structure. The report addresses factors affecting the disaster response, such as personnel training and facility assessment. Furthermore, it includes a discussion on managing psychological stressors experienced by those involved, particularly the elderly. The conclusion highlights the importance of security measures and screening processes to prevent such incidents. Recommendations include adopting security protocols and screening procedures for social gatherings. The report underscores the need for timely and adequate responses, stakeholder participation, and stress management plans to mitigate the impact of such events. The report references several sources to support its claims and provides a detailed analysis of the disaster response plan, including recommendations for future improvements.