The tension between these two approaches is one of the most substantive debates in event sustainability right now. Here are the arguments on both sides, stated as fairly as possible.
Arguments in favour of accreditations
They provide a recognised external signal. Those B Corp certificates, ISO 20121 accreditations, or Green Tourism Gold awards are legible to a buyer, investor, or procurement team who has no time to interrogate the underlying data. Recognition shortcuts trust.
They create an organisational baseline. The process of achieving accreditation, particularly standards like ISO 20121, forces an organisation to document its management systems, assign accountability, and establish consistent processes. That discipline has genuine value independent of the badge.
They are widely understood. Procurement teams, CSR managers, and ESG-reporting organisations increasingly include accreditation status in supplier questionnaires and tender criteria. Having one means you pass a filter you might otherwise fail.
They involve independent verification. The credibility of a third-party auditor checking your systems and practices is real. It is harder to game than self-reported data.
They persist between events. An accreditation applies to the organisation continuously, not just when an event is in progress. That matters for venues and agencies trying to demonstrate a standing commitment rather than event-by-event performance.
Arguments against accreditations – or for their limits
They assess management systems, not outcomes. ISO 20121 is explicit about this: it certifies that you have a sustainability management system in place, not that your events are actually sustainable. An organisation can hold ISO 20121 and still run events with poor environmental performance, low social value, and weak governance – as long as the system exists. The ISO standard page itself frames the certification as applying to an Event Sustainability Management System – not to event outcomes. The Centre for Sport and Human Rights, in its analysis of the 2024 revision, confirms that “ISO 20121 is a management standard” and notes that “event organisers are only certified on the requirements in the Standard itself, not on the elements set out in the Annexes” – meaning even the guidance on supply chain management and social impact sits outside the scope of what certification actually verifies.
They go out of date between renewal cycles. Accreditations are typically reviewed annually or every three years. The badge on the website reflects a point-in-time assessment, not current performance. A lot changes in twelve months.
They are organisational, not event-level. No accreditation tells a corporate client how their specific event performed. The B Corp certificate on the venue’s wall says nothing about the conference that ran last Thursday. That gap is unbridgeable within the accreditation model.
They are expensive and inaccessible for smaller operators. The cost, time, and administrative burden of achieving and maintaining accreditation systematically exclude smaller agencies, independent venues, and boutique suppliers – precisely the businesses most likely to be doing genuinely good work without the infrastructure to document it.
They can become a destination rather than a journey. Once the badge is achieved, the incentive to improve diminishes. Accreditation models reward compliance with a standard, not continuous improvement beyond it.
They are increasingly vulnerable to scrutiny. As greenwashing litigation increases and regulators tighten claims standards, an accreditation that certifies systems rather than outcomes offers limited legal protection if actual performance data tells a different story. In fact, accredited venues and hotels that deliver poor outcomes have an even riskier proposition.
Arguments in favour of performance management
It measures what actually happened. Event-level performance data tells you, and your client, how a specific event actually performed across ESG channels. This is the data that investors, analysts and clients actually want.
It enables genuine improvement. You cannot improve what you do not measure. Performance management creates a baseline, a benchmark, and a re-review – the three conditions necessary for demonstrable progress. Accreditation creates a floor; performance management creates a trajectory.
It is proportionate and accessible. A structured performance review that takes only a few minutes to complete and costs very little is within reach of any size of organisation. The democratisation of that data is itself a social value argument.
It produces client-facing deliverables. A scorecard, a benchmark comparison, a Social Value Yield (SaVY) figure – these are outputs a corporate client can use directly in their own reporting, board presentations, and supplier sustainability disclosures. An accreditation certificate cannot do this.
It is what the regulatory direction is demanding. CSRD requires evidenced, auditable data at supply chain level. The Green Claims Code requires substantiation of specific claims. Performance data is the answer to both. Accreditation is not.
The most honest summary
Accreditations and performance management are not competitors, of course. They answer different questions.
Accreditations say: this organisation has systems and intent. Performance management says: this event produced these outcomes.
The problem is that the market has, until recently, treated accreditations as sufficient. The regulatory environment, institutional investor pressure, and procurement evolution are all moving in the same direction: from intent to evidence, from system to outcome, from organisational to event-level. Accreditation alone is increasingly insufficient as a standalone claim. Performance management is the direction of travel.
