Identify Potential Event Risks & Mitigation Ideas

For a '[Event Type, e.g., 'large outdoor concert', 'multi-day international conference', 'charity walkathon']' being held at '[General Location Type, e.g., 'a city park', 'a convention center', 'multiple city streets']' with an expected attendance of [Number], identify 5-7 potential risks beyond common weather/speaker cancellation. For each risk, suggest one general mitigation strategy. Risks could relate to: [e.g., 'Crowd control', 'Technology failure (registration system, live stream)', 'Transportation/Parking issues', 'Security threats', 'Health emergencies', 'Vendor non-performance', 'Communication breakdown'].
**Disclaimer:** This is for brainstorming. A formal risk assessment should be done with safety/security professionals.