The most widely used indicators are CO2 emissions per attendee and the waste percentage. CO2 emissions consist of transport, energy and catering. The waste percentage shows what percentage was separated or reused. A third indicator is the share of sustainable suppliers. For CO2 measurement there are online calculation tools specifically for events.
Also ask your events agency for an impact report afterwards; more and more agencies can provide one. In addition, measure attendee satisfaction with sustainability aspects through a short survey afterwards. Measuring without communicating has little value. Share the outcomes internally and externally and show sustainability as a concrete promise.
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