CLT Envirolaw is a consultancy that helps organizations implement ISO 20121, a sustainability management system for event planning and delivery. ISO 20121 provides a global framework to encourage more sustainable events. It applies to all types of organizations involved in event design and delivery. Key aspects of ISO 20121 include emphasis on strategy and context, management of supply chains, continual improvement, leadership commitment, stakeholder communication, and legal compliance. Certification can provide financial benefits like cost savings, improved reputation, and differentiation from competitors. Common barriers to implementation include lack of understanding and buy-in, and perceived complexity.