This document specifies requirements for an event sustainability management system for any type of event or event-related activity, and provides guidance on conforming to those requirements. This document is applicable to any organization that wishes to: a) establish, implement, maintain and improve an event sustainability management system; b) ensure that it is in conformity with its stated sustainable development policy; c) achieve the intended result(s) of its event sustainability management system; d) demonstrate voluntary conformity with this document by: - first party (self-determination and self-declaration); - second party (confirmation of conformance by parties having an interest in the organization, such as clients, or by other persons on their behalf); - an independent third party (e.g. a certification body).