1. Age Restriction: Set a minimum age requirement for attendees, typically 18 or 21 years old, to ensure a mature and responsible crowd.

2. Prohibited Items: Clearly define and communicate a list of prohibited items, such as weapons, drugs, alcohol (if there are age restrictions), glass containers, fireworks, and any other items that may pose a safety risk or go against venue regulations.

3. Ticketing and Entry: Establish ticketing procedures, including options for online and on-site ticket sales. Ensure that entry and exit points are clearly marked and staffed for efficient and safe crowd management.

4. Bag Checks and Security: Implement thorough bag checks and security measures to maintain the safety and well-being of attendees. This may include metal detectors, security personnel, and surveillance cameras.

5. Alcohol Consumption: If alcohol is permitted, clearly define rules regarding the consumption and purchase of alcoholic beverages. Check local regulations and obtain the necessary licenses and permits.

6. Stage Diving and Crowdsurfing: Clearly communicate rules regarding stage diving and crowdsurfing, as these activities can be dangerous for both performers and attendees. It may be necessary to prohibit these activities altogether.

7. Noise Restrictions: Address any local noise ordinances and regulations, ensuring that the festival complies with the permitted sound levels and times.

8. Stage Time Limits: Establish strict stage time limits for each band to ensure a smooth schedule and minimize delays. Enforce these time limits to avoid any unnecessary disruptions or inconveniences to other performers.

9. Cleanliness and Waste Management: Set guidelines for waste management and cleanliness, including designated trash and recycling areas, as well as responsible disposal of cigarette butts.

10. Code of Conduct: Establish and communicate a code of conduct that emphasizes respect, tolerance, and safety for all attendees. This includes a zero-tolerance policy for any form of harassment or violence.

11. Emergency Procedures: Develop and communicate emergency procedures, including evacuation routes, first aid stations, and contact information for emergency services.

12. Performer Guidelines: Communicate specific guidelines to performers, including stage setup, soundcheck times, and any restrictions on pyrotechnics or stage equipment.

Remember that these rules and guidelines may vary depending on the location, regulations, and specific requirements of the metal festival. It is important to adapt and modify these rules accordingly to ensure a successful and safe event.